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HD4850 + Vf900cu: My temps

post #1 of 10
Thread Starter 
After buying a Sapphire Hd4850 I decided to fit it with a Vf900cu cooler I had lying around Which was previously mounted on my old backup card (an X1650 XT)

The idle temps look okay, with the DispIO at 36*c MemIO at 46*c and Shadercore at 38*c. I know I'd be doing a lot worse if I had a stock single slot cooler.
Under load however the MemIO tops out at 78*c and that's with a 20*c room temperature, with dispIO and Shader running at 65-70*c. It's winter now, during summer room temperature can go up to 35*c

Does this sound about right for a 4850 equipped with a Vf900cu? I re-installed it several times with varying amounts of AS5 and always getting roughly the same results.
Should I be able to do better? Or is it worth it to switch to an Accelero S1 rev. 2 with a 120mm attached? I was planning to overclock my card. (Though I'm worried about my E4600 being a possible bottleneck with it's 2mb cache.)

As far as case airflow goes, I've got a Centurion 5 with a 80mm 1300 rpm in front, a 1200rpm 120mm in the back and an 80mm 1200rpm in the side (which is pointed at the graphics card, roughly.)
Al Bundy
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Al Bundy
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post #2 of 10
Take off the side panel of your case, wait 30 minutes, then see what your temps are. That will tell you if your case has no airflow.
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post #3 of 10
4850's produce a lot of heat,your proccy won't be a problem but for overclocking you will need a better cooler.
    
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post #4 of 10
Do you have the vram sinked?
I had an 8800GT with a VF900 and the vram usually ran 8c less than the core sinked something like this:



I switched to these which gave the same results:

post #5 of 10
Thread Starter 
Thx for the replies,

First off, removing the side panel makes about 2*c difference under load and almost none while idle. I take it this means my airflow isn't that bad.

Second, I used those Zalman VRam heat sinks that came with the vf900cu, though I don't know if they make a measurable difference as the MemIO temp sensor is located on the Gpu die.

The thing is a good while ago I heard that the Vf900cu gets easily saturated under load. This seems plausible as it's not a particularly large heat sink. Any thoughts on that?

And as it stands now I've got my eye on the Accelero S1 Rev. 2 with a nice and quiet 120mm on it.
Al Bundy
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Al Bundy
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post #6 of 10
Hey average, what sapphire board do you have and did you check the temps on the stock cooler that came with it?
post #7 of 10
Thread Starter 
I got the Sapphire Hd4850 512 Dual Slot cooler.

http://www.sapphiretech.com/us/produ...gpid=249&grp=3

The temps were okay, better than a single slot cooler. But the vf900 is providing slightly better temps. It's about a 5 to 10*c difference.
Al Bundy
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Al Bundy
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post #8 of 10
Zalman is getting lazy lately. They're not coming out any new vga coolers for the X2 and their current HSF are not up to the job cooling the hotter chips.
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post #9 of 10
Thread Starter 
Minor update: I bought the AC Accellero Twin Turbo heatsink. It was the same price as an accellero S1 rev 2 + decent 120mm fan. But I've hit a snag.
The sapphire Hd4850 I have is a relatively short card. It's not as long as other 4850's. It's one of the reasons I bought that particular card. The Accellero TT however significantly extends the length of my card. I will either have to remove my 2nd harddrive which I use to backup files, or get a longer case.
Al Bundy
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Al Bundy
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post #10 of 10
Quote:
Originally Posted by Averageman View Post
Minor update: I bought the AC Accellero Twin Turbo heatsink. It was the same price as an accellero S1 rev 2 + decent 120mm fan. But I've hit a snag.
The sapphire Hd4850 I have is a relatively short card. It's not as long as other 4850's. It's one of the reasons I bought that particular card. The Accellero TT however significantly extends the length of my card. I will either have to remove my 2nd harddrive which I use to backup files, or get a longer case.
I'm not sure what case you have, but assuming you have a specific spot for HDs (say at the bottom?) you can always move the one HD to a CD-Rom tray and just put mounts on the side so it fits.
    
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