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Help me OC my 7900GT plz

post #1 of 9
Thread Starter 
OK so im new to overclocking. I've nailed the basics of CPU s, now i need help to OC my Graphics Card.

Its an XFX 7900GT 256mb with a Zalman Fatal1ty FS-V7 fan.

Taken from dex100s post on highest OCs on 7 Series cards:
Quote:
Originally Posted by dex100
7900GT
Namrac EVGA KO edition OCed:655mhz/1.6ghz
tuchan 512mb 720mhz/1.5ghz
Sideburns 690mhz/1.82ghz
Syrillian 660/1660
Sdumper SLI 695/1800
NuclearCrap 680/1800
Muffin OC: 680mhz/2ghz
FlaKing OC: 650mhz/1.84ghz
pauldovi 732mhz/1.72ghz

OK lets take Sideburn's entry for example. He claims to get 690mhz/1.82ghz

Now am i correct in assuming the 690mhz is the Core Bus?

Now the second bit confuses me. 1.82ghz???. looking at my NVIDIA Control Panel there are 2 controls. the 1st is the Core Bus. The 2nd is Memory Bus.
The slider on my Memory Bus only goes up to 822mhz. Thats less than half of what these guys are getting if the 1.82ghz is Memory Bus.

Someone please enlighten me. What am i missing here?
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post #2 of 9
Im pretty sure all of those cards have been volt modded to achieve such high frequencys. I know for fact sideburns has his volt modded.
You will be lucky to see 600 core 1600 memory with stock voltages.

if your overclocking your memory to 822 thats a great overclock. That is 1644mhz effective. Always double the memory clock, because its DDR memory on your card. So 822= 1644 effective
    
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post #3 of 9
Thread Starter 
Without a volt mod what can i max it at?

Its currently at 546/822
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post #4 of 9
Thats pretty good. I can get mine to 580 1400, plenty good enough for me
    
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post #5 of 9
If I recall correctly I was able to hit 560...I think.

I know that you did not ask, so forgive my boldness. The volt-mod is really easy. REALLY EASY.

http://endeavorquest.net:8880/7900GT_VM/index.htm

Please... Use a multi-meter to verify voltages if you decide to try it.
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post #6 of 9
Thread Starter 
nah im not volt modding.

I could barely afford the card to start with, i don't wanna have to replace it when i bugger it up.
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post #7 of 9
Quote:
Originally Posted by Mr. Pig View Post
nah im not volt modding.

I could barely afford the card to start with, i don't wanna have to replace it when i bugger it up.
Understood, and respected. Perhaps later on down the road. Enjoy your new purchase.
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post #8 of 9
Thread Starter 
Well i've just acquired my mates old FX5200 128mb so i think i'll use it for my 1st venture into voltmodding.

That is if i can ever find a guide for such an old card. All the links i try seem to be dead.

Anyone round here ever mod an FX5200?

Got a link to a guide?
Took pictures of yours?
Make a step by step detailed guide and forget to post it?
*Clutches at straws*
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post #9 of 9
Not aware of any volt mods for that card, search the FAQ sectionb. I will give it a try now

EDIT: Googled for ya, theres one for an ABIT. think it should work

http://forums.vr-zone.com/showthread.php?t=30238

See what everyone else thinks 1st
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