What would be good turn key systems to run dual GTX 750 Ti's on?

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Profile Tom Miller
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Message 1844298 - Posted: 25 Jan 2017, 15:36:02 UTC

I like the rapid performance (about 15-20 minutes per WU) of my GTX 750 Ti. And apparently, it uses less power than "average". I have seen decent prices (near $100) for a new GTX 750 Ti. I am reluctant to buy another system just to run the 2nd card.

My experience with running WU's on CPUs is that I will need liquid cooling to get the CPUs cool enough to run at 100% so I might as well go with a GPU-oriented system.

So can anybody offer advice/examples of a good turn key system to run dual 750's on?

Thanks,

Tom Miller
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Message 1844393 - Posted: 26 Jan 2017, 0:12:11 UTC - in response to Message 1844298.  

@ Tom Miller:

I run all my computers with all their two-slot-wide x16 PCIe slots full of GTX 750 Ti cards (except I need to buy two more for my latest build). The CPUs range from a 2600K to a 5960X, but even the 2600K has no trouble running two GTX 750 Ti cards.

How many two-slot-wide x16 PCIe slots does your existing motherboard with the Xeon CPU have? Fill 'em up and crunch! Same for the others.

On my 3770K system, I reserve 1 CPU to support two GTX 750Ti cards running 2 WUs each. I still have 5% idle CPU time after running 7 CPU WUs for other projects.
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Message 1844521 - Posted: 26 Jan 2017, 16:03:05 UTC - in response to Message 1844393.  

How many two-slot-wide x16 PCIe slots does your existing motherboard with the Xeon CPU have? Fill 'em up and crunch! Same for the others.


Ah, part of the hardware limitations of the HP brand is they are fussy about their power supplies. So unless you can figure out the way to hack a regular PS so it will correctly drive an HP Xeon motherboard you can't provide enough watts. :(

Let me try another angle here. What size of power supplies are you using with the two GTX 750 Ti's?

Thanks,
Tom
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Message 1844690 - Posted: 27 Jan 2017, 4:36:55 UTC - in response to Message 1844521.  
Last modified: 27 Jan 2017, 4:37:30 UTC

My oldest build with a 2600K and two GTX 750 TI cards has 450 watts. Other systems are larger.

According to GPU-Z version 1.16.0, with the cards 98% busy and 60% for their memory controllers, their peak draw is about 45 watts each. They are rated as 60 watt cards, and they might draw that when first powered on. These are powered only from the motherboard, but some vendors also have 6-hole PCIe power ports on them (e.g., Gigabyte).
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Message 1844977 - Posted: 28 Jan 2017, 18:42:23 UTC - in response to Message 1844690.  

My oldest build with a 2600K and two GTX 750 TI cards has 450 watts. Other systems are larger.

According to GPU-Z version 1.16.0, with the cards 98% busy and 60% for their memory controllers, their peak draw is about 45 watts each. They are rated as 60 watt cards, and they might draw that when first powered on. These are powered only from the motherboard, but some vendors also have 6-hole PCIe power ports on them (e.g., Gigabyte).


Thank you. I will go look at my Z400 and see how large the PS is. I can see a slot for a 2nd GTX 750 Ti but the catch is, its RIGHT on top of the original and I am worried about them being so close together they fry each other :(

Tom
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Message 1845065 - Posted: 29 Jan 2017, 5:45:03 UTC - in response to Message 1844977.  

@ Tom Miller:
I have two systems running 4 GTX 750 Ti cards close together in each. My "hottest" 4-card system (least effective case cooling) has a temperature range of 64-75 C, and the other system's range is 59-73 C.
My three systems with only 2 cards each have ranges of 53-59, 56-73, and 58-66.
I live in Vietnam, and the room temperature here now is 32 C.
Conclusion: if your system has halfway decent airflow, there won't be a problem with overheating. However, as always, YMMV.
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Message 1845089 - Posted: 29 Jan 2017, 7:47:18 UTC - in response to Message 1844977.  

@ Tom Miller:
After writing my prior reply, I went and checked my computers case fans and found 1 of the 5 had died in the "hottest" case. After replacing it, the temperature range is now 60-73 C on the 4-cards.
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Message 1847339 - Posted: 8 Feb 2017, 15:51:47 UTC
Last modified: 8 Feb 2017, 15:55:35 UTC

We like to run our GPUs using a GPU rack connected to the main motherboard (i7) using x1 to x16 PCIE risers.

As long as you running on Gen3 you will not see any processing difference on SETI, or higher core required projects such as Collatz, using these x1 Risers.

The main benefit of these racks is cooling and the fact that you can fit up to six double width GPUs, with a slot space in-between each.

These GPU racks were used heavily by Bitcoin minders before ASC devices took over.
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Questions and Answers : GPU applications : What would be good turn key systems to run dual GTX 750 Ti's on?


 
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