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Radeon HD 2900XT turning off in 3D

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First post, by dexvx

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I have an ATI branded Radeon HD 2900XT 512MB. In 3D, it seems to turn off within a minute into it. No sign of texture corruption during 3D. Temperature sensors are well within normal (<70C GPU). Strangely, the GPU fan won't even rev up hard. And also weird, the card will refuse to POST afterwards for awhile (days). Any ideas why?

I have a Diamond R2900XT and I'm thinking about just flashing the ATI card with the Diamond VBIOS to see if it'll help.

Unless someone has a VBIOS for a built by ATI Radeon HD 2900XT 512MB that they can share? I tried two on TechPowerUp, and they did not work out real well.

Reply 2 of 8, by Munx

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I had a very similar issue and it involved power delivery. Everything would run fine until I would run anything in fullscreen.
2900xt actually under-clocks itself by ~30% when in 2D or when running things in windowed mode.
Turned out it was a loose 8pin power plug that worked as a 6pin as a result, so everything would crash when the card would run in fullscreen and demanded more power.

So basically, check your PSU and make sure your cables are plugged in properly.

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Reply 3 of 8, by dexvx

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I'm using a Corsair CX750M PSU. It can do 62A on the 12V line, so I don't think it's a power issue. Chassis is an open chassis, so shouldn't be any air flow issues. Cables are plugged in snugly.

http://www.corsair.com/en-us/cx-series-cx750m … ular-atx-psu-na

Strangely, I have a another Diamond branded 2900XT that also has issues. It can run maybe a couple minutes of 3DMark06, and then freeze up. I ran GPU-Z in the background with logging, and it appears that it crashes around 70C. I'm going to reseat the heatsink on that guy and see if it helps.

Reply 4 of 8, by kanecvr

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I'm pretty sure it's not the 2900xt cards since both act up on the same machine. Try testing them on a different computer, or try another catalyst and chipset driver combination. I've tested my 2900xt on a p35 and nforce 780i boards, it worked fine in either case using the latest driver.

It could still be a power supply issue - I noticed I had stability issues with a brand new sirtec 700W psu while using certain hardware.

Reply 5 of 8, by matze79

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My "New PSU" came with defective Capacitors.. it was laying around "NEW" in a Warehouse for several Years. 😁

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Reply 6 of 8, by kanecvr

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matze79 wrote:

My "New PSU" came with defective Capacitors.. it was laying around "NEW" in a Warehouse for several Years. 😁

Same here. Two bloated 1000nf caps inside a brand new PSU. I didn't even have to open it up to see them, they were visible trough the 120mm fan's grill.

Reply 7 of 8, by dexvx

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The PSU in particular has powered many other GPU's before (Radeon 4890, GTX 680, 7900 GTX SLI), the most stressful probably 9800 GTX+ in SLI.

However, I will try again, as it has been awhile. Thanks all for suggestions !

Reply 8 of 8, by Unknown_K

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I have a 9800GTX+ SLI setup and it isn't anywhere near as demanding on power as my 4870x2 card.

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