4870 Overclocking Thread

[ZOMGVTEK]

Just got my 4870 1GB in...
I modded the stock BIOS and I figgured 1200 would be enough on the RAM, but aparently not! Its stable at 865/1200 right now, i need to step the BIOS up a notch to get the ram at its limit! But the core cant go above 865, its stable for hours at 865, but locks up at 870 .

http://www.techpowerup.com/gpuz/9ewwv/

VMOD TIME!

I was thinking of messing with a softmod, but its probably just easier to hardmod.

Whats a good voltage for the stock cooler? Fan idles around 45%, load at 100%, i think the temps are 46 idle, 54 load. I changed the thermal paste and lapped the heatsink of course.

[Carfax]

Your ram can do 1200?

On air?

[ZOMGVTEK]

It starts getting nasty at 1250, but it does 1245 for 10 loops on crysis. I just backed it down to 1200 since there is no noticeable gains whatsoever from 1200 to 1245, and i like 1200 better anyways.

Now i need to vmod that core and hope for 900+ mhz!

And yes, this is all on air. My rig is shoved in my closet, and it gets quite toasty in there after a while. About 26-28ºC ambients generally.

This card is doing well, but it still gets poor 3DM06 scores. I was doing 18k+ easy on my G92 in the sig, now im at 16kish... No cheats or tweaks, i broke 20k cheating on the G92.

[Carfax]

Mine is rock solid stable in gaming at 850/1100..

Setting the memory at 1200 results in artifacting on the desktop, and putting the core over 850 results in freezing during game play.

And yes, this is all on air. My rig is shoved in my closet, and it gets quite toasty in there after a while. About 26-28ºC ambients generally.

Be careful that you don't kill your card, or shorten it's life expectancy.

My card runs very cool. It never passes 53c on load, which I believe is due to the open air heat pipe cooling system. The closed cooling system which is standard on the 4870 gives higher temps, but it funnels the hot air outside the case.

Open air coolers like mine push a lot of hot air into the case, but if you have good air flow, it's not a problem. My Coolermaster HAF 932 has 6 120mm fans, 1 140mm exhaust fan, and one big 230mm intake in the front

This card is doing well, but it still gets poor 3DM06 scores.

3DM is overrated.. I can't even tell you the last time I ran that benchmark

The best way to test for system stability is to play some strenuous games, which coincidentally, is much more enjoyable than running benchmarks

BTW, what brand is your card?

[pH(x)]

It starts getting nasty at 1250, but it does 1245 for 10 loops on crysis. I just backed it down to 1200 since there is no noticeable gains whatsoever from 1200 to 1245, and i like 1200 better anyways.

Now i need to vmod that core and hope for 900+ mhz!

And yes, this is all on air. My rig is shoved in my closet, and it gets quite toasty in there after a while. About 26-28ºC ambients generally.

This card is doing well, but it still gets poor 3DM06 scores. I was doing 18k+ easy on my G92 in the sig, now im at 16kish... No cheats or tweaks, i broke 20k cheating on the G92.

This shows just that one takes synthetic benchmark test better than the other does, it highlights the uselessness of synth benchmarks; except in specific version:version synth test comparisons... even then it struggles to find use.

Ultimately the 4870 1GB overclocked has an order of magnitude more power potential and memory bandwidth, and also a later version of DX10 (???)

[q head]

i had an open air 4850 heavily overclocked before and my MB temps after long gaming sessions were max 36c. now with this 4870 card i idle at that temp and will load up to like 45c. I tried to manage the cables as best so as to not block airflow when connecting the extra power cables, but do you think this card is really just generating that much more heat?

[noah]

I just ran 3d06 at 850/1100 for 21k on cf asus DK 4870 1b a e8600 never going over 50*c on cards. My secret is to run with a single 120mm fan on the outside of the cards - It has lowered my load about 25*c for about 9.99$ usd. I will crank this up a bit more when i get home from work tonight. I honestly think that these cards are fairly cpu bound at this point, and i'm already running at 4.3ghz+