Message boards :
Number crunching :
Athon 64 x 2 @3GHz or Phenom 9550 @ 2.4GHz
Message board moderation
Author | Message |
---|---|
tbret Send message Joined: 28 May 99 Posts: 3380 Credit: 296,162,071 RAC: 40 |
My computer ID: 5940401 has been running for a long time with an Athlon 64 x 2 5800+ slightly overclocked via FSB only, to just about 3GHz. I was in my office looking around at stuff I was going to give away or put-away and I saw this old board with a Phenom 9550 4-core in it and thought to myself, "that might be sort of interesting..." and so I swapped the Athlon 64 for the Phenom. So I've taken the number of crunching processors up from 1 to 3, but I've dropped the speed from 3 to 2.4Ghz. (in each case I left a core idle to feed the video card). Also, let's take into account that it is running XP Pro 32-bit and is bound at 3.25GB of memory. Anybody want to speculate as to whether the very steady 18-19k RAC (nVidia GTX 460) goes up or down on that computer? |
Cosmic_Ocean Send message Joined: 23 Dec 00 Posts: 3027 Credit: 13,516,867 RAC: 13 |
Should go up. As long as the GPU's RAC stays somewhat steady, the CPU crunching has gone from 1x3GHz to 3x2.4GHz (effectively 7.2GHz). The task durations will increase, but you are doing ~233% the amount work in the same period of time on CPU. Linux laptop: record uptime: 1511d 20h 19m (ended due to the power brick giving-up) |
tbret Send message Joined: 28 May 99 Posts: 3380 Credit: 296,162,071 RAC: 40 |
Should go up. As long as the GPU's RAC stays somewhat steady, the CPU crunching has gone from 1x3GHz to 3x2.4GHz (effectively 7.2GHz). The task durations will increase, but you are doing ~233% the amount work in the same period of time on CPU. But I've slowed the CPU-portion of the processing for the GTX460. I noticed that the "free core" was staying about 50% busy, which is a little high. If I slow the GPU, even a little, there's no way that the extra 2 cores at 2.4GHz can possibly overcome the loss. |
skildude Send message Joined: 4 Oct 00 Posts: 9541 Credit: 50,759,529 RAC: 60 |
I'm not even sure why you stopped using the 1 core in the first place. The amount of CPU use is minimal on Multibeam tasks. You may notice a few minutes added to your crunching. I have an FX-8150 that I keep 1 core idle for Poem @home to run on the GPU. I've not noticed any time differences for my CPU work In a rich man's house there is no place to spit but his face. Diogenes Of Sinope |
rob smith Send message Joined: 7 Mar 03 Posts: 22186 Credit: 416,307,556 RAC: 380 |
A GTX460 doesn't stress a dual core 3200+, never mind a quad core phenom, so don't bother reserving one core to service the GPU, just let everything crunch and gain a few hundred more a day. Bob Smith Member of Seti PIPPS (Pluto is a Planet Protest Society) Somewhere in the (un)known Universe? |
AndyJ Send message Joined: 17 Aug 02 Posts: 248 Credit: 27,380,797 RAC: 0 |
|
Claggy Send message Joined: 5 Jul 99 Posts: 4654 Credit: 47,537,079 RAC: 4 |
A GTX460 doesn't stress a dual core 3200+, never mind a quad core phenom, so don't bother reserving one core to service the GPU, just let everything crunch and gain a few hundred more a day. Unless you're running the Nvidia OpenCL Astropulse app, and have 270.xx or later drivers, then a full core is required to feed the app, otherwise it just stutters along, Claggy |
tbret Send message Joined: 28 May 99 Posts: 3380 Credit: 296,162,071 RAC: 40 |
I'm not even sure why you stopped using the 1 core in the first place. The amount of CPU use is minimal on Multibeam tasks. You may notice a few minutes added to your crunching. Seems reasonable to me, so next time I'm at the computer I'll add the other core to crunch and we'll see how that goes. |
tbret Send message Joined: 28 May 99 Posts: 3380 Credit: 296,162,071 RAC: 40 |
Hey! I found-out! The RAC is falling like a stone! <ok, ok... I just needed to amuse myself> |
skildude Send message Joined: 4 Oct 00 Posts: 9541 Credit: 50,759,529 RAC: 60 |
confused... So the RAC dropped after adding the Core or before? In a rich man's house there is no place to spit but his face. Diogenes Of Sinope |
tbret Send message Joined: 28 May 99 Posts: 3380 Credit: 296,162,071 RAC: 40 |
confused... So the RAC dropped after adding the Core or before? skildude - I'm being "funny." I didn't get a chance to add the last core before I ran out of CUDA work, which is funny because I was worried about the CPU not being able to feed the GPU fast enough. The RAC is falling because we're out of work. It was "gallows humor." |
Treasurer Send message Joined: 13 Dec 05 Posts: 109 Credit: 1,569,762 RAC: 0 |
Should go up. As long as the GPU's RAC stays somewhat steady, the CPU crunching has gone from 1x3GHz to 3x2.4GHz (effectively 7.2GHz). The task durations will increase, but you are doing ~233% the amount work in the same period of time on CPU. Not only the clock is important. The Phenoms always do more MIPS than Athlons at the same clocks on my systems. EDIT: Example: This Athlon x2 runs @2200 and this Phenom x3 runs @2100. Compare the benchmark results for yourself. |
skildude Send message Joined: 4 Oct 00 Posts: 9541 Credit: 50,759,529 RAC: 60 |
confused... So the RAC dropped after adding the Core or before? I thought that was reserved for the RIP skildude thread In a rich man's house there is no place to spit but his face. Diogenes Of Sinope |
©2024 University of California
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.