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Ati 4850 256mb card overheating

Last response: in Graphics & Displays
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January 25, 2010 11:58:03 AM

Hello, I need your help! What happens is that when my card reaches 64 degrees(C) the card over heats and restarts my computer. Why is it doing that? My friend has the same card and he got it up to 90 degrees before it overheard (and that's overclocking, i don't do that coz it'll overheat in a minute!)

Is it a hardware or driver problem? Will I need to buy a new one?
a c 147 U Graphics card
January 25, 2010 12:15:35 PM

You card isn't overheating, something else is occurring. What are your system specs, specifically your power supply. Also, did this card ever work without an issue? How long have you had it, is it new or used?
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January 25, 2010 12:23:47 PM

I've had the card for about 6 months (bought new) and it's always done that. I took it back and they say it works fine, but I think they are just too cheap to give me a replacement!

My specs are AMD Athlon 64 X2 Dual core 4200+ 2.21 GHz
4 Gb ram
32 bit operating system (currently Win 7 - did it in XP as well)
ATI Sapphire 4850 HD video card
3X 1TB Seagate hard drives

I also have a pimped out case covered with fans to help keep the system cool, but doesn't work well enough i guess! (front, back and side fans)
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January 25, 2010 12:54:47 PM

ATI cards (4000series) do use a lot of power and i see you are using 3x 1TB drives... Power might be a problem. What PSU do you have??

try testing the card with only one drive
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January 25, 2010 12:59:03 PM

Back when I first got the card, I had only a 500GB drive in it and it still did it

PSU is a Huntkey ATX 12v/ 220v-50Hz,A4
300 watt
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a c 376 U Graphics card
January 25, 2010 1:42:06 PM

Well that PSU is obviously the issue. 300 watts is waaay too low for an HD4850. I'm surprised it runs at all really. You want at least a 400w PSU made by a good manufacturer.
Also, 256mb HD4850? I didn't even know they made that card with such low memory.
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January 25, 2010 1:46:56 PM

jyjjy said:
Well that PSU is obviously the issue. 300 watts is waaay too low for an HD4850. I'm surprised it runs at all really. You want at least a 400w PSU made by a good manufacturer.
Also, 256mb HD4850? I didn't even know they made that card with such low memory.


Correction: 512mb
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January 25, 2010 2:26:30 PM

yess, i had the same problem with my 4890 and i was using a very cheap 550watt PSU... i sold the PSU and bought a Vantec Ion2 520watt and i'm getting great performance from it
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January 25, 2010 2:30:13 PM

cromedome said:
yess, i had the same problem with my 4890 and i was using a very cheap 550watt PSU... i sold the PSU and bought a Vantec Ion2 520watt and i'm getting great performance from it


Well, I will get a new one tomorrow.. same one you got if I can get it!
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a c 376 U Graphics card
January 25, 2010 2:37:53 PM

Corsair, Antec, Seasonic and OCZ tend to make quality PSUs. I'd look for one of them.
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Best solution

a c 147 U Graphics card
January 25, 2010 2:46:02 PM

deadhero said:

PSU is a Huntkey ATX 12v/ 220v-50Hz,A4
300 watt

BINGO! The 4850 recommended minimum requirements are 450W and 30A. Just take those specs along with you and find a 450W PSU and make sure it can handle 30A on the 12V rails. If the PSU has more than 1 12V rail, as in it will say 12V1 12V2, etc, you will want to look at the 12V wattage. It is usually printed on the PSU under the 12V rail ratings. Take that wattage and divide by 12v, that will give you the combined amperage rating. ex. on a 450W PSU it might say 12v1=18A, 12V2=18A, and then under that 360W. 360W/12V=30A. You will want a 12V wattage rating of 360W or above. Depending where you hail from you will have different selections. Jyjjy's list is all good, there are alot of other good brands but these are populate. Thermaltake, BFG, Coolermaster(some of them), Enermax, FPS, Zalman, and several others. There is alot of preference in the PSU market to. Alot of people will point you to Corsair, but there are alot of GOOD PSU's out there, and even MORE bad ones.

99% sure this is your problem.
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January 25, 2010 4:09:27 PM

Thanks a lot everyone.. glad to finally figure this out, it's been bothering me for a long time!
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a c 147 U Graphics card
January 25, 2010 4:23:02 PM

Report back and let us know.
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January 25, 2010 4:23:44 PM

jay2tall said:
Report back and let us know.


Will do!
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January 26, 2010 5:32:04 AM

I bought a 400w power supply and it seems to have done the trick. However, I have no idea about good or bad PSU's so i'd like to know how mine rates up.

Huntkey (only company I could get - I'm in China right now)
400w 220V 50hz 4A +5V&+3.3V: 130W
+12V1=14A, +12V2=13A(Peak 16.5A), +5V=14A, PG +3.3V=20A, 12V=0.3A, +5Vsb=3.0A(Peak 4.0A)

My video card runs a lot cooler now.
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a c 376 U Graphics card
January 26, 2010 6:48:51 AM

That's better but still not particularly good. Don't be surprised if the PSU dies before too long.
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a b U Graphics card
January 26, 2010 8:08:14 AM

Crossing my fingers to that.

Good for you your PSU didn't blow up with all the load coming from the 4850. :) 
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February 1, 2010 10:56:48 PM

Best answer selected by deadhero.
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