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Old 05-06-2008, 01:26 AM   #1 (permalink)
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Default Weird Performance Issue

I've discovered a bit of curious performance problem with my machine. It's about 2 years old and has never really been overclocked until lately. Before I go into detail, here are the specs:

AMD Athlon 64 X2 3800
4GB OCZ Platinum DDR-PC3200
Gigabyte GA-K8N Pro-SLI
ATI HD 3870 512MB
150GB WD Raptor 10,000rpm
SB Audigy 2 ZS Gamer

Windows XP SP2 32bit

Since the day I built the machine I always felt like it was under performing, but it did decent enough in the games I was playing at the time to not pursue the problem much further then ensuring all drivers and such were up to date.

However, I have a new machine now and have recently been playing with some overclocks on the machine listed above and ran into a very curious issue. I overclocked the machine to 2.3GHz, which is not a huge OC for this chip. Had no problems, handled the OC just fine and was in my 9th hour of Prime95 testing. I got home from work and started up Crysis, to my surprise I was getting phenominally better FPS then I expected. I used to get 20-30 on medium settings and was now getting 45-55fps.

First thing that came to mind is that the overclock cannot be solely responsible for that type of improvement, so I flipped back to windows and noticed the 2 Prime95's were still running....now my curiosity was really peeked as I would have expected hindered performance with them running. I shut them both down and went back to Crysis and my fps was right back to what I expected 20-30....

To further test this I put my machine back to its normal clockrate and settings and tested again with near identical results. I went on and tested this with some other games (AoC Beta, CS:Source, & Gears of War). Each time I was getting much much better fps with the Prime95's running.

Obviously this shows my initial thoughts were right, the machine has been under performing since the start. I'm dumbfounded as to why though. I don't want to be running Prime95 whenever I run games:laughing:, and would like to get my this machine running like that naturally.

Any ideas on what might be the issue? Or ideas on why Prime95 would have this kind of effect?

TIA
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Old 05-07-2008, 12:00 AM   #2 (permalink)
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Default Re: Weird Performance Issue

You probably haven't enabled the ... ah what was that setting in BIOS. I think it was C1E, there you go. That setting enables your computer to use all cores because when it's not enabled, the cores actually lessen in performance. Since you're not using it to it's limit.
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Old 05-07-2008, 02:18 AM   #3 (permalink)
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Default Re: Weird Performance Issue

C1E and EIST is only for Intel chips not AMD. You should disable Cool n' Quiet. It's an energy saver that will reduce power
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Old 05-07-2008, 07:58 AM   #4 (permalink)
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Default Re: Weird Performance Issue

yeah with prime running the CPU was being pushed hard so it was clocking it fully. but otherwise cool and quiet was throttling it back.

That is the first thing I do on AMD builds is disable cool and quiet in bios heh.
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Old 05-07-2008, 09:43 AM   #5 (permalink)
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Default Re: Weird Performance Issue

GA-K8N has no option for that; kinda one of my regrets, after some research I found out that quite a few Gigabyte boards don't have a bios option for it.

I've been using RightMark to control Cool&Quiet manually, makes no difference in this case though...

Oh well, appreciate the insight nonetheless.
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Old 05-07-2008, 10:00 AM   #6 (permalink)
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Default Re: Weird Performance Issue

It could have been that the processor is a slight bottle neck with the graphics card that you are using...
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Old 05-07-2008, 10:28 AM   #7 (permalink)
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Default Re: Weird Performance Issue

Quote:
Originally Posted by charles_scott View Post
It could have been that the processor is a slight bottle neck with the graphics card that you are using...
Yeah, I think that's already been established. Trying to figure out why, if Prime95 can force the cpu to overcome it then it can be done on it's own with the right settings/drivers/etc, there's no question of that. Doesn't seem anyones experienced anything similar, so I guess I'm SOL.

Its not a huge deal, I don't use this machine much anymore but I also don't like leaving mysteries unsolved lol
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Old 05-07-2008, 11:45 AM   #8 (permalink)
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Default Re: Weird Performance Issue

have you installed the dual core drivers from Amd's website?
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Old 05-07-2008, 02:14 PM   #9 (permalink)
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Default Re: Weird Performance Issue

Yes, also with and without the dual-core optimizer. Also double checked windows updates to make sure the critical dual-core patches were installed.
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Old 05-07-2008, 03:09 PM   #10 (permalink)
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Default Re: Weird Performance Issue

bizarro....
im going to try running crysis and orthos to see if that happens to me. but i get 30ish maybe frames a second already. woo-hoo!
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