Now that I've upgraded my main cruncher to an i7/4770K, I'm now interested in upgrading my GPU(s) to one of the EVGA GTX7xx series, especially those that have ACX cooling. My main concern of these cards is how hot are they? With the open design it appears that it exhausts inside the case, raising the case temps. Right now I'm running with a EVGA GTX660SC which exhausts outside the case and my CPU temps are averaging 48~52c using a Corsair H75 LCS drawing air from inside the case to cool the radiator, and with summer fast approaching I want to keep the temps well below 70c.

---

I don't buy computers, I build them!!

My 760 is running around 61 to 67 depending on the indoor temp.

It is also above the 670 in the case.

Both are EVGA, but only the 760 has the ACX cooling.

---

My 760 is running around 61 to 67 depending on the indoor temp.

It is also above the 670 in the case.

Both are EVGA, but only the 760 has the ACX cooling.

I'm thinking about 2 x EVGA GTX750Ti FTW.

http://www.evga.com/Products/Product.aspx?pn=02G-P4-3757-KR

How are your CPU & case temps?

---

I don't buy computers, I build them!!

I'm thinking about 2 x EVGA GTX750Ti FTW.

The Maxwell cards don't process as much work as the older series cards- you'll have to wait for an update to the application for that to happen.
They have no issues with the longer running WUs, but shorties are no longer short- what used to take around 10min on my GTX 560Ti overclock takes around 14-16min.

But I still consider it worth while running the GTX 750Tis- running 3 of them still uses less power than one GTX460 or one GTX560Ti. And since they use less power, they run much cooler.

Ambient temperature here is generally in the low to mid 30°c (high 30°s isn't unusual), my GTX560Ti used to run in the low 70°s with the fan at around 85-90%. I've now got 2 * GTX 750Tis in that system & the hottest one is 60° @ 70% fan speed (it'd be even cooler if the 2nd card wasn't right next to it).
I've tried running 3 WUs at a time, and it gives a huge improvement in throughput for the longer running WUs, but shorties slow down even more- so much so that you end up doing less work per hour, so I've stuck with just doing 2 WUs at a time.
I expect that once an improved application comes out that takes advantage of their new architecture they will run hotter, but not much.

They really are a very low power GPU, especially for the amount of work they are able to do.
Most other cards can do more work per hour, but for work done per Joule of energy used the Maxwell cards are king.


EDIT- the EVGA cards will probably make you system temperatures higher than my Gigabyte ones make mine. All the air from the EVGA is exhausted internally, with the Gigabyte heatsink half the air is exhausted externally.

---

Grant
Darwin NT

EDIT- the EVGA cards will probably make you system temperatures higher than my Gigabyte ones make mine. All the air from the EVGA is exhausted internally, with the Gigabyte heatsink half the air is exhausted externally.

THAT'S my major concern. I just might start off with one and see how the CPU/case temps are over the long run. I might have to consider getting a card from another series as I only use EVGA.

---

I don't buy computers, I build them!!

EDIT- the EVGA cards will probably make you system temperatures higher than my Gigabyte ones make mine. All the air from the EVGA is exhausted internally, with the Gigabyte heatsink half the air is exhausted externally.

THAT'S my major concern. I just might start off with one and see how the CPU/case temps are over the long run. I might have to consider getting a card from another series as I only use EVGA.

Keep in mind it won't be nearly as hot as running any previous generation of card.

The reference cards only use 60W max, the overclocked model you're looking at is rated for 85W. A GTX660 (depending on the model) uses almost twice that power. Given that the present applications aren't optimised for Maxwell nearly as much as they are for previous architectures & the new cards won't even be using nearly that much power. At stock speeds, my cards only occasionally hit 70% of their maximum rated power (ie they hit about 42W peak).
3 (stock) * GTX-750Tis use about the same power as one GTX-760Ti (3*60W= 180, v 170W).

---

Grant
Darwin NT

EDIT- the EVGA cards will probably make you system temperatures higher than my Gigabyte ones make mine. All the air from the EVGA is exhausted internally, with the Gigabyte heatsink half the air is exhausted externally.

THAT'S my major concern. I just might start off with one and see how the CPU/case temps are over the long run. I might have to consider getting a card from another series as I only use EVGA.

Keep in mind it won't be nearly as hot as running any previous generation of card.

The reference cards only use 60W max, the overclocked model you're looking at is rated for 85W. A GTX660 (depending on the model) uses almost twice that power. Given that the present applications aren't optimised for Maxwell nearly as much as they are for previous architectures & the new cards won't even be using nearly that much power. At stock speeds, my cards only occasionally hit 70% of their maximum rated power (ie they hit about 42W peak).
3 (stock) * GTX-750Tis use about the same power as one GTX-760Ti (3*60W= 180, v 170W).

The wattage is not a concern as I have a 1200 watt PSU. I realize that the 750Ti draws lower power thus creating a lower temp, but since the LCS is drawing air from inside the case, adding additional heat to that air is my ultimate concern. If the room sat in the direction of the breezes or if I had a/c it wouldn't be a problem. As it is, the room sits on the 2nd floor and the windows are not pointed in the right direction. Only ceiling and window fans keep the ambient room temps to a reasonable degree in the summer, and it can get 100F+ in the good ole summer time.

---

I don't buy computers, I build them!!

My 760 is running around 61 to 67 depending on the indoor temp.

It is also above the 670 in the case.

Both are EVGA, but only the 760 has the ACX cooling.

I'm thinking about 2 x EVGA GTX750Ti FTW.

http://www.evga.com/Products/Product.aspx?pn=02G-P4-3757-KR

How are your CPU & case temps?

I don't crunch on the CPU, so those temps are quite normal.

---

The wattage is not a concern as I have a 1200 watt PSU. I realize that the 750Ti draws lower power thus creating a lower temp, but since the LCS is drawing air from inside the case, adding additional heat to that air is my ultimate concern.

As you mentioned- the less power the card requires, the less heat will be produced. And the lower the effect on system temps will be, even with a less than optimal cooling arrangement.

---

Grant
Darwin NT

I have a 750Ti that does very well. The only reason I would not recommend it would be that:

Larger die Maxwell architecture on 28nm designs look to be in the works and should hit within 1-2 months, I think these would travel up the product stack and hit something in the 765 Ti range with one of the upcoming models.

Also if you do any PC gaming at all if you went with dual 750Ti's you can't SLI them. The next Maxwell cards up in the product stack should be SLI capable. If you are spending the $ to help others out with distributed computing, you might as well be able to game very nicely in your spare time too.

If you did get a 780 I would advise on a reference (blower) cooler. If you ever wanted to add another 780 the reference coolers would perform better in close proximity. I have two in SLI and my case temps are near ambient, but its a high airflow case.

If you are looking for high overclocks/not looking to SLI/don't care about slightly higher case temps the ACX should be fine.

---

I've got the MSI GeForce Gaming N780 TF 3GD5/OC (http://www.msi.com/product/vga/N780_TF_3GD5OC.html).

I've never had a temperature higher than 61c, either while gaming or while running seti (modified the config file to run 3 WU in parallel, so load is higher than 95% all the time). I am satisfied with the gaming experience on 1080p, I've played Crysis 3, Metro LL and few others on maximum settings without any issues, never measured the FPS though.

I am impressed with MSI's cooling solution. I have been running seti for 3 days non-stop now, maximum temp is 61c, maximum fan speed 1491 RPM (PWM at max 51%) and it is quiet.. Room temperature around 25c nowadays. I am using the MSI OC mode that can be activated with the gaming app.

I am struggling with the i7 4770k temps running on stock fan so I will add an H100i soon. I've opened another thread few days ago about my CPU temps.

---

I want to thank everyone for your comments and I've decided to get at least one of these.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814487028

---

I don't buy computers, I build them!!

I want to thank everyone for your comments and I've decided to get at least one of these.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814487028

Nice...

...using a Corsair H75 LCS drawing air from inside the case to cool the radiator, and with summer fast approaching I want to keep the temps well below 70c.

If I remember correctly, Corsair recommends pulling air from outside the case through the radiator to the inside of the case. (I've never set one up that way, either.) Provided that your case has a fan in the bottom blowing up and either holes or a fan at the top pushing air out of the case, that really might work.

I've got two open-sided Galaxy GTX 560Ti cards sitting next to each other in an Antec 300 with a Corsair 70. I added a side fan that does not come with the case. It's a three speed fan set to the lowest speed. Those cards work at 70C or below, but the ambient temp is kept below 85F, mostly below 80F. The Phenom II 1045 is a 125w CPU and does not crunch at all, so your results will be different than mine.

You know it's going to be different for everyone in every situation, but I find that *the* most important thing I can do with open-sided GPUs to keep them cool is to put them in a case with a fan sucking air into the case at the bottom with another blowing air out of the case (or even just an empty grate) at the top.

I had one small case that I could not keep cool and in an act of desperation cut a hole in the bottom of the case to add a fan (there was already an exhaust fan at the top). As it turned-out, I didn't even need the fan I added at the bottom. Just the hole in the bottom of the case let the top fan pull air through the case and made it one of my cooler-running cases (I added the fan anyway, since I had already purchased it).

From that point on every case I've bought has had bottom-up ventilation and it works well. I find that side fans, blowing too hard in across the cards, is less effective because it fights the air trying to exhaust from the sides of the GPUs. That configuration works better with my cards that exhaust out of the case.

Yes, Corsair does recommend that and it is true in both of my i7/930 (GTX460SE) & i7/950 (2 x GTX660SC) machines in this case http://us.coolermaster.com/en/service/support/haf-932/. The problem was the GPUs ran what I considered high temps, >85c when ambient temps reached mid 70s ~ lo 80s F, running 2 x AP/Open_CL each that I suspended GPU processing during most of the day even with the 230mm side fan blowing directly on them at max speed. There is a grill in the bottom of the case to mount a fan, but the cables from the PSU disrupt the air flow enough that it is useless.

With the new processor and GPU(s), replacing the long dead i7/930, drawing less power thus creating less heat, I'm hoping that I will be able to draw the inside air to keep everything cool enough in the same case. Remember, the room gets quite toasty in the summer and I trying not to bring in hotter air than necessary. If I had the finances and expertise I'd like run every thing with full water blocks. And, maybe place the reservoirs in ice (sic).

---

I don't buy computers, I build them!!

If I had the finances and expertise I'd like run every thing with full water blocks.

My "dream idea" was to somehow geothermal couple a cooling system (with a heat exchanger) and keep things cool-ish.

Then I admitted I was being OCD and quit thinking about it.

If I had the finances and expertise I'd like run every thing with full water blocks.

My "dream idea" was to somehow geothermal couple a cooling system (with a heat exchanger) and keep things cool-ish.

Then I admitted I was being OCD and quit thinking about it.

I know my signature says " I don't buy computers, I build them!", but if and when I win the lotto, which I must admit that I play a lot, I will be buying my dream machine or two from a site called Originpc.com. It will cost me 6~7k, but I think I can work with it.

Case: Corsair 900D
Case Fans: ORIGIN High-Performance Ultra Silent Fans - Black
Motherboard: ASUS Sabertooth X79
System Cooling: ORIGIN CRYOGENIC Custom Liquid Cooling CPU Only (refill kit included)
CRYOGENIC Tubing Color: White
CRYOGENIC Liquid: Ice Dragon High Performance Coolant - White
Processors: Intel Extreme Core i7 4960X Hex-Core 3.6GHz (4.0GHz TurboBoost), 15MB Cache
Power Supply: 1.2 Kilowatt Corsair AX1200i
Graphic Cards: Dual 3GB NVIDIA GTX 780 Ti
Memory: 16GB Corsair Dominator Platinum 1866Mhz (4x4GB)
Operating System: Genuine MS Windows 7 Ultimate 64-Bit Edition
Hard Drive One: 120GB ORIGIN PC Approved Solid State Drive
Hard Drive Two: 120GB ORIGIN PC Approved Solid State Drive
Hard Drive Three: 1TB Western Digital Velociraptor SATA 6.0Gb/s, 10,000RPM, 64MB Cache
Optical Drive One: 14X Blu-ray Burner (No DVD/Blu-ray Playback Software Included)
Audio: On Board Audio
Networking: Onboard Network Port
ORIGIN Maximum Protection Shipping Process: ORIGIN Wooden Crate Armor
Warranty: 3 Year Part Replacement and Free Shipping Warranty with Lifetime Labor/24-7 Support
ORIGIN Recovery: ORIGIN Recovery USB Flash Drive
Evolve Part Upgrade Service: 3 Year Evolve Part Upgrade Service with Free Shipping
________________________________________
Total: $6,352.29

---

I don't buy computers, I build them!!

I built my latest rig ten days ago using a Cooler Master HAF XM case (bottom, front, back, top and big side vents) and installed four GTX750Ti cards from Gigabyte (http://www.newegg.com/Product/Product.aspx?Item=N82E16814125502) chosen because they get power directly from the PSU. I know these cards can be powered from the PCIe socket, but I didn't want a loose connection to cause a problem with the mainboard.

I'm using a Cooler Master H80i exhausting outside the case, an i7-4770k cpu, and installed a 140MM side fan blowing on the GTX cards. My temps (in southern Vietnam) with the air at 30C this morning are 65C+/-3 for the cpu, and 60C+/-2 for all the GTX cards. Even in the afternoon when the temp here is hitting 38C, none of the temps are in the danger zone, and all below 75C.

After running the Intel stress test, I saw I had a 28C safety zone on the cpu temps. I don't remember if I ran that in the afternoon here or not.

One thing I noticed - very little or no hot air comes out the back from the GTX cards. Since that H80i sucks so much air from inside the case and with the top fans, a little air goes IN from the back even with the side and front fans pushing air in.

---

I built my latest rig ten days ago using a Cooler Master HAF XM case (bottom, front, back, top and big side vents) and installed four GTX750Ti cards from Gigabyte (http://www.newegg.com/Product/Product.aspx?Item=N82E16814125502) chosen because they get power directly from the PSU. I know these cards can be powered from the PCIe socket, but I didn't want a loose connection to cause a problem with the mainboard.

I'm using a Cooler Master H80i exhausting outside the case, an i7-4770k cpu, and installed a 140MM side fan blowing on the GTX cards. My temps (in southern Vietnam) with the air at 30C this morning are 65C+/-3 for the cpu, and 60C+/-2 for all the GTX cards. Even in the afternoon when the temp here is hitting 38C, none of the temps are in the danger zone, and all below 75C.

After running the Intel stress test, I saw I had a 28C safety zone on the cpu temps. I don't remember if I ran that in the afternoon here or not.

One thing I noticed - very little or no hot air comes out the back from the GTX cards. Since that H80i sucks so much air from inside the case and with the top fans, a little air goes IN from the back even with the side and front fans pushing air in.

Ah 'Nam, remember it well the good and the bad. Used to stay in a little place named Bien Hoa many, many moons ago. I like your setup, and the temp examples that you gave are exactly what I was hoping to see. Your case is a mid-tower, what board are you using that you can cram 4 dual slot cards into? It's got to be an E-ATX type. Isn't kind of crowded with limited air flow?

---

I don't buy computers, I build them!!

If I had the finances and expertise I'd like run every thing with full water blocks.

My "dream idea" was to somehow geothermal couple a cooling system (with a heat exchanger) and keep things cool-ish.

Then I admitted I was being OCD and quit thinking about it.

The best cooling system I've ever seen on line was where a person mounted water blocks on the CPU & video card, each one had it's own pump, and they used the water from outside his house in a pond. I think in the summer it got up to the low teens (°c), in the winter his computer cooling system stopped the pond from freezing over completely...

---

Grant
Darwin NT