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overclocking gfx and sli, is it worth it.

post #1 of 21
Thread Starter 
Ok so i was just rummuging through some usefull apps trying to fine tune the oc on my cards, when i noticed somthing i had never really cared to before.
Using cool bits i set the manual overclock sliders to 800 for mem and 600 for core and began to artifact test.
After opening up pcwiz2k6 i went to the display section, selected the vid card section and noticed that the frequinces on card one(will call this one C1)
were just as i had set them 800 for mem and 600 for core. But card 2(c2) on the other hand was still running at a stock 660 mem and 480 core.
I again tested this with riva tuner and the same thing was apparent, c2 was not being overclocked. And rivatuner gives no option to overclock it.
Correct me if im wrong but, both cards will use the slower clock and the lower amount of ram(both are same for ram though so owhell), But i do gain fps, 3dmarks, and higher temps. Why?
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Deep Blue
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post #2 of 21
Well Both crds will run at there Individual speeds when in SLI or CF. However As to overclocking the Second card im not to sure.
post #3 of 21
Funny... I've been wondering the same on if the other card actually will get OC'ed
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post #4 of 21
Thread Starter 
Well i dived a little more into riva tuner and pc wizard, so i set the coolbits back to auto. pcwizard now only pics up one of the cards core speed, and riva still accurately picks up both but the other is still stock and still running slower. As of right now i see no clear way to oc it.
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post #5 of 21
Thread Starter 
Ok so update time, Im still playing around in riva tuner(and some in coolbits) and noticed that with sli disabled there is a fan tab in the overclocking section of rivatuner. But when you enable sli that fan tab goes away. pcwizard says that both fan speeds are running idle at 17% (of max i assume) and when you click the coolbits option to have fans run at max all the time, it only goes up to 27%. Still working with rivatuner's power user tab too see if i can change this.
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post #6 of 21
Thread Starter 
Hmm well upon further diving into overclocking both cards while they are in SLI proved to be a little more messy than i thought. If you download coolbits 2.0 you are downloading a pre-edited version of coolbits and performs best(should i dare say only on) single gpu cards. Well the apparent fix for this is Creating your own Coolbits using regedit. Here is a link explaining what you to do. And here is another link to back it up and offer some performance tips as well. I have a friend who has tried this, and apparently it worked on both his cards( but i was not able to verify this as he did not have pcwizard 2006 installed, and was playing WoW cause he is an addict.) Anyone willing to try it out?
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post #7 of 21
I have had no problems overclocking my cards in SLI. I got both my 7600GT's up to 1650/620 (ish...cant remember what it exactly was)
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post #8 of 21
Thread Starter 
i bet you they are not! go get pc wizard and look at the freq's of both your cards.
EDIT: post a screen shot if you can.
EDIT: or use riva's hardware mon and add your second card.
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post #9 of 21
yeah see that's the stuff that kills people. i have a friend with a single 7600gt XXX from xfx (whereas i have 2 in SLI), dont remember the numbers but this was an issue a few months ago - we tested one card stock clocks, then mine in sli oc'ed by about 40/15. didnt scale right :/

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post #10 of 21
Where is it in PC Wizard? And you may be right, but coolbits tells me that the clocks are such, so who knows.
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