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Help Overclocking 5850

post #1 of 14
Thread Starter 
Hey guys, im my journey to ever increase my RAC per day i want to try my hand at overclocking
The 5850 i have is this one
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150477
i believe that its a non reference thus no voltage control..
I have the program sapphire Trixx and allows me to adjust my voltage and clock speeds etc, i have stock cooling still but am going to get the Zalman VF3000A when i get money back from army travel ( if you guys could suggest a better cooler like a arctic cooler etc it will be fine).. i am running my phenom x4 955 c3 at stock speeds with CnQ enabled to help on power bills.. Gpuz doesnt give me the VRM temp readings thats the biggest concern i have about overclocking my 5850.. Could some one please steer me in the right direction with the voltage and clock speeds etc...

Cheers


Im at 880 core/ 950 mem at 1.120v currently 10min gone in occt with no errors =) Fingers crossed

Below is a picture of my temp readings approx 15min into the OCCT test for reference
Edited by BrendoHAF932 - 3/22/11 at 10:41pm
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post #2 of 14
Hello, which projects are you running?

Please take note that not all projects with ATI cards support benefit from memory speed, you could reduce your temperature by bumping this as low as possible, < 500. Somebody else can confirm but I think this is possible for Milkyway and DNETC, not sure with Collatz though.

Also try considering MSI afterburner as well for your OC smile.gif
post #3 of 14
Thread Starter 
im mainly running DNETC ive tried using msi afterburner but cant get my head around how to enable voltage control for a non reference 5850
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post #4 of 14
Nice choice, that project gives tons of points per runtime.

Try something like furmark to stress test, to get the maximum CORE overclock to temperature balance. I used to run 950 core on my sapphire 5850, temperature never passes 73 deg. Furmark is a lot more stressing than DNETC btw.

And about voltage control, maybe you can't modify that, imho already good enough leaving it at stock (auto), unless you want to undervolt.

Anyway, try setting your MEMORY overclock to maybe ~400 and see if it affects your WU time and temps on DNETC.
post #5 of 14
unfortunately xfx has thermal problems..................

keep your memory lower than default levels to stabilize your OC and keep heat down

the you can run your core higher and higher spend $30 and buy an aftermarket cooler
post #6 of 14
i run my 5850 at 920 core with no added vcore. has run stable for 6mths+
    
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post #7 of 14
DR, the powercolor 5850's run at higher vcore of 1.16v by default compared to the XFX 5850's at 1.12v - which allows for a slightly higher overclock smile.gif

OP, 880 is pretty decent for your card without a vcore increase, my powercolor 5850's can only run 925 core max while BOINCing 24/7, and that is with the higher vocre.

Unfortunately, like my powercolor 5850's, the vrm used on your XFX5850 does not support software voltage control, so the only way to increase vcore is a voltage mod on your card.

Luckily for you, your card isn't that hard to do a voltage mod on, as there is a pad under the FB pin of your VRM which provides an accessible point to solder in a resistor. With a 100k resisitor between that pad and ground, your vcore will jump to 1.25v and you'll be able to overclock up near 1000 core smile.gif

But be warned, volt mods can go wrong and you can quickly kill your card if you make even the smallest mistake. Also, with your core running at 1.25v, you'll need much better gpu cooling or your card will overheat and fail.

Saying all that, I'd actually clock your current card down a little. I'd set it at 850/850 and leave it at that. Sure your RAC will drop a little, but your card will also run a little cooler and will last much longer and in the end the longer it lasts, the more BOINCing you can do smile.gif
Edited by un-nefer - 3/23/11 at 10:26pm
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post #8 of 14
my 5850 was an asus tongue.gif and i have no idea what the vcore is as i never touch it lol
    
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post #9 of 14
My Asus 5850 directcu does 1100/1300 with vcore increase tongue.gif

If you're looking to get 5850's, then those Asus DirectCU's with voltage adjustment support are the best of the bunch. Add a universal waterblock and bump vcore up and run 1100 core in BOINC 24/7 smile.gif

Edit: I've seen them around for $200, which is bargain for the PPD v cost v powerconsumption
Edited by un-nefer - 3/24/11 at 8:58am
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post #10 of 14
Thread Starter 
Thanks guys, i will try the 850/850, before i tried the ~400 memory and it had artifact galore, also just a quick question on power usage, how much would my pc use if my 955 is at stock with CnQ enabled ( clocks down to 20.5w according to HWmoniter) and my 5850 running 850/850 roughly 24/7?? electricity is expensive in Australia lol some where near the 0.23 cents im paying for a KwHr
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