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ATI Overdrive question

Last response: in Graphics & Displays
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April 27, 2010 9:59:15 AM

I currently have Crossfired 2 x ATI XFX HD4850 GPU's in an Antec 1200 case, one card with 1GB GDDR3 and the other with 512MB GDDR3. If my GPU's are only running at like 48C would it be benifical to unlock ATI Overdrive to boost up the memory clock and GPU clock to get better performance? or should I just leave it at auto?

My Specs
Antec 1200 case
1000W BFG 12V/2.2 PSU
Asus M4A79XTD EVO AM3 Mobo
Windows 7 Home Premium 64bit
AMD Phenom II X4 955 Black Edition CPU (overclocked to 4ghz) w/ Thermaltake SpinQ heatsink
8GB G. Skill DDR3 1600mhz memory
Crossfire 2 x ATI XFX HD4850 GDDR3 GPU's
WD 1TB 7200rpm Caviar Black Hard Drive

More about : ati overdrive question

a c 130 U Graphics card
April 27, 2010 12:12:06 PM

You're fine at 48c to overclock. The roof you want to hit is ~80for your GPUs and ~55 for your CPU.
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a b U Graphics card
April 27, 2010 1:02:21 PM

Is that 48C idle or 48C load?
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April 27, 2010 5:56:36 PM

48C while playing games like FarCry 2
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a b U Graphics card
April 27, 2010 8:41:19 PM

Ah, excellent temps. So you won't be temp limited (my 4850 could handle 100+C temps). However, some 4850's are poor OCer's, especially for RAM.
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a c 130 U Graphics card
April 27, 2010 9:33:06 PM

Agreed, my sapphire doesn't wanna go over a 50mhz OC.
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a b U Graphics card
April 27, 2010 9:57:01 PM

You might be able to get a little better OC by turning down the mem a hair. Sometimes that helps, or not.
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April 28, 2010 5:32:00 AM

I need help. I unlocked ati overdrive and the default for both my GPUs were 625mhz core clock and 993mhz memory clock. Now whenever I change these settings they crash my computer either in the test custom clocks or when I load up a game, but the temps don't go up very high. Can someone tell me how to overclock my gpus properly?
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a c 130 U Graphics card
April 28, 2010 9:41:36 AM

How much are you increasing them by? You should be able to hit 650core and 1120mem just fine.

Use the autotune function if you don't feel safe OC'ing. Also, the orange-screen thing when testing the GPU is normal.
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a b U Graphics card
April 28, 2010 11:51:57 AM

Not necessarily. If one of those 4850's is an old one, it might not OC at all.
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a c 130 U Graphics card
April 28, 2010 12:06:08 PM

Autotune should help at the very least...and the overclocks aren't even that good, just 25 on the core (less than 10%), and 4% on the RAM.

I read that Autotune actually increases voltages on the memory.
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April 28, 2010 4:27:49 PM

I bought Both cards within a month of each other. I just realized after I bought the 512mb one on newegg.com that I actually got the 1GB card cheaper at best buy with my employee discount. I brought both cards up to 700mhz core clock and 1100 mem clock b4 they crashed, was those settings too high? And where is this autotune? And should I have enable overdrive checked?
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a c 130 U Graphics card
April 28, 2010 4:35:35 PM

If you can OC it's unlocked, so don't worry. 700mhz is great on the core, but if it crashed, reduce it to 675, and run a few games for stability. Reduce the memory to 1075 as well.
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