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9800pro core/RAM speed OC ratio?

post #1 of 21
Thread Starter 
Well, I've got a 9800 pro if you hadn't guessed I'd just like to know maybe some simple math formulas or ratios for overclocking this card. I did read the ATITool overclocking FAQ/guide, and that did help, but I'd just like to have the knowledge to follow using more than one type of card.
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post #2 of 21
Quote:
Originally Posted by CanadaGradeEh
Well, I've got a 9800 pro if you hadn't guessed I'd just like to know maybe some simple math formulas or ratios for overclocking this card. I did read the ATITool overclocking FAQ/guide, and that did help, but I'd just like to have the knowledge to follow using more than one type of card.
Hmmm. I'm not quite sure I understand your question really... Overclocking any hardware is more a matter of trial and error testing than applying any kind of formula, or at least that's my understanding...

With stock cooling and stock thermal paste, your card is likely to reach a core speed of around 385MHz to 395MHz and your memory will likely reach 345MHz to 350MHz. With a Zalman VF700-Cu, some decent copper RAM sinks, some cured AS5 and a case fan blowing cool air from outside of the case at the VF700-Cu and RAM sinks, you could be looking at a core of 420MHz+ and a Mem of 375MHz+.

So, with stock cooling it's likely to be an average increase in frequency of around 2.75% and with decent air cooling (as described above) it's going to be an average increase of around 10.5%, a 3.8X greater o/c with decent cooling compared to stock cooling.

When I owned a 9800Pro, I got the core to 418MHz and the Mem to 378MHz with the decent air cooling described above.

Hope this is of some help .

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post #3 of 21
like stated above, there is no real ratios in overclocking, just push the ram and the core both as hard as you can untill you get artifacting.... and some better cooling such as the vf700 or vf 900 will help you really max the card out...
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post #4 of 21
most importanly, you want to be able to push the core the most, if that means holding the memory back some to get the most core, do it. I have a 9800pro with a vf700 on it and can run at 430/365(730). before I got the cooler, I could barely hit XT speeds 412/3X0 (cant remember the memory speed on an XT).
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post #5 of 21
Thread Starter 
Hmm, my stock cooler died a couple of weeks ago so I glued my old Barton 2500+'s stock heatsink fan onto the GPU's heatsink. It's working fine

I'd just like to ask you guys though, do you think that it would cool better than the original fan? It is bigger, but I don't know if it's faster or slower than the original fan. What's your take?

I'd just like to know because I want to know if it's safe to try and flash to a 9800XT (or atleast try and push to those speeds).
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post #6 of 21
Quote:
Originally Posted by CanadaGradeEh
Hmm, my stock cooler died a couple of weeks ago so I glued my old Barton 2500+'s stock heatsink fan onto the GPU's heatsink. It's working fine

I'd just like to ask you guys though, do you think that it would cool better than the original fan? It is bigger, but I don't know if it's faster or slower than the original fan. What's your take?

I'd just like to know because I want to know if it's safe to try and flash to a 9800XT (or atleast try and push to those speeds).
There is no real danger in pushing the card's frequencies to any speed as long as you increase in small enough increments and stop when the card artifacts. All you need to do is run ATi tool and it will find the max frequencies for you, stopping when your card starts to artifact. If you just manually increase your frequencies by, say, 150MHz, there might be a chance you'll damage your card, but using ATi tool in "find max" mode will do the card no harm.

I would advise you to o/c the card first to see if it can handle XT speeds before trying any kind of XT BIOS flash.

Good luck with the o/c.

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post #7 of 21
Quote:
Originally Posted by CanadaGradeEh
Hmm, my stock cooler died a couple of weeks ago so I glued my old Barton 2500+'s stock heatsink fan onto the GPU's heatsink. It's working fine

I'd just like to ask you guys though, do you think that it would cool better than the original fan? It is bigger, but I don't know if it's faster or slower than the original fan. What's your take?

I'd just like to know because I want to know if it's safe to try and flash to a 9800XT (or atleast try and push to those speeds).
it probably does cool a little better than the stock fan, but not by much. as posted above see how high you can get you clock speeds before flashing to see if it can handle the extra speed, if it can without any artifacting, then go ahead and flash it
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post #8 of 21
Quote:
Originally Posted by CanadaGradeEh
Hmm, my stock cooler died a couple of weeks ago so I glued my old Barton 2500+'s stock heatsink fan onto the GPU's heatsink. It's working fine

I'd just like to ask you guys though, do you think that it would cool better than the original fan? It is bigger, but I don't know if it's faster or slower than the original fan. What's your take?

I'd just like to know because I want to know if it's safe to try and flash to a 9800XT (or atleast try and push to those speeds).
I would suggest a better cooling solution if you intend to push the core and memory to it's limit's.
These 9800pro's generate alot of heat (something I noticed from the 9700pro to 9800pro).

The ARTIC COOLING SILENCER rev3..here.

I use one on my 9800pro and it does the job fine.


cheers
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post #9 of 21
TheCooler you glued on IMO will be sufficient for now. Like said above theres no real Ration in overclocking with a G-card you just need to push the mem and core up at small increments and have a test phase each time to make sure you are not artifacting.
post #10 of 21
for using ati tool, i'd reccomend finding max core first. then bump that down a few mhz, then use the find max mem. bump the memory down a few mhz then see if you can raise the core a little more.
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