HD4850 Weird Video Corruption

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HD4850 Weird Video Corruption

Postby brassicGamer » 2017-3-22 @ 11:03

Hi folks. There are probably better places I could ask this, but you lot are very knowledgeable when it comes not only to old hardware but also generally outdated stuff. Yes, Vista era isn't quite 'retro' yet, but I thought I'd ask anyway. I've seen some video corruption issues in my time but never this:

20170321_212420-1600x900.jpg


It's a Sapphire ATi Radeon HD 4850 1GB running on a Gigabyte board with a Q9550 CPU and 3GB PC2 6400 RAM. The card has recently been purchased from eBay (to add to a Crossfire setup) so I'd like to establish the cause of the corruption prior to leaving feedback for the seller. It was all running fine until I'd installed a bunch of updates to Windows. I have not yet downloaded the video driver (hence the resolution) because I wanted to update the OS first. This happened following a restart during those updates. I had already installed drivers for the chipset, LAN and audio.

Not only was there the pattern you can see, but there was also a lag of about 5 seconds between input and screen refresh so it's really weird. I felt the card and it wasn't running hot. I fully expected the corruption to remain present upon restarting because it looked like a hardware issue rather than software, but it cleared and booted back to a normal looking desktop upon restart. I then ran the video RAM stress test included on the UBCD and did 3 runs with zero errors.

Does anyone have an explanation? Thanks in advance.
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Re: HD4850 Weird Video Corruption

Postby Jade Falcon » 2017-3-22 @ 12:27

I'd install the missing video drivers if you have not done so already
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Re: HD4850 Weird Video Corruption

Postby agent_x007 » 2017-3-22 @ 14:26

Other than cracked solder under VRAM/GPU, I guess it's either PCI-e slot (dirty/busted) or MB doesn't like this specific card.

Crucial thing is to install drivers.
If Windows doesn't even log-in to desktop - card is probably dead (oven-o-therapy could make it work).
Check how it runs in other PC (before doing anything else).
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Re: HD4850 Weird Video Corruption

Postby brassicGamer » 2017-3-22 @ 15:36

Cheers guys. Fingers crossed it's software and not hardware.
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Re: HD4850 Weird Video Corruption

Postby MrMateczko » 2017-3-22 @ 23:18

Vista - there's your problem :)
Is there any corruption when you enter BIOS? If there are, then it's dead, and only oven might help for a short while....it will break again, I've been there. The whole oven stuff is just temporary, even if it might work after like 2 years, it WILL break eventually.
If there is no corruption in BIOS, my sarcastic remark about Vista might not be that far from the truth...
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Re: HD4850 Weird Video Corruption

Postby brassicGamer » 2017-3-23 @ 09:35

I've got 3 of the things: the one I bought when new, the 2nd I bought last year to play with Crossfire, and the one I bought most recently. I thought that was the one I was using here but turns out it's not (I know because the new one is 1GB). Just before I removed the dodgy one, it displayed the same symptoms and then refused to output a signal by the time it got to the desktop. I think it's a dud, or the VGA port has an issue because when I put the newer purchase in the system, it worked 100% fine. It was also detected automatically by Windows and installed the driver, something that never happened with the other card after a number of opportunities.

I'm confused because I tested the dodgy one extensively so I don't know what's happened. Could be an SMD part with an intermittent connection or something because it definitely looks like hardware corruption to me. Maybe a bake would fix it. I'll have to investigate further...
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Re: HD4850 Weird Video Corruption

Postby meljor » 2017-3-23 @ 20:33

It's allergic to something, take it to a doctor.... :lol:
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