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7850 issues after RMA

B

Bennyb

2[H]4U
Joined
Dec 31, 2002
Messages
2,556
Hi,

Until about 3 weeks ago I had been using thiscard in my computer. The card died and was sent back for an RMA.

In the meanwhile I began using 2 Radeon 4850's with crossfire.

The motherboard I am using is an ASRock H77M.

Today I received my replacement card (here).

I removed the older cards drivers and attempted to get the new card to work. Unfortunately I could not get a video signal when the card was in the main PCIe 3.0 slot.

I know that the slot is working, as I was using it only minutes before.

I didn't think much of it as the performance was still a major boost over the 2x4850, but after trying to play some of the games I had been playing before my first card died I noticed stuttering and lag that I had never seen before.

My questions are:

Is there some setting i'm overlooking in the Bios or something? Did using the 2x4850 change some setting that would cause my main slot not to output any video?

Is this what could be causing my performance to suffer?

Any insight would be wonderful before I get on the phone with Diamond again.
 
I am guessing they sent you a DOA replacement.

However, here are a few things to try.

1. Clear the CMOS - there should be a jumper or button on your motherboard to do this (while powered off).

2. Make sure that the PCI-e power cord is plugged into the video card.

3. Try it in the second slot. If it works, then maybe your first slot died.

If none of those help, I would have to say they sent you a bad card.
 
I cleared the CMOS already, that didn't work.

The power cord is plugged in.

The card works in the second slot only, but the first slot is still working as I have tried it with an alternate video card.

I'm pretty much stumped here. The card definitely works, but doesn't work in the primary slot for some reason.

I'm guessing there's some weird compatibility issue here...
 
Maybe the first slot is messed up even though the 4850 works in it. It could be that the slot is not supplying enough power to the 7850, but can still supply enough power for the 4850 to work.

Maybe when the old card died, it messed up something with that slot as well.
 
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