Please help, TWO X1900XTs don't work in EITHER of my PCs

[imported_goku]

Originally posted by: Gagan
sounds like your Card is failing to power.
From what you're saying is that in theory the x1900xt works with the A8n32, which is right.

The thing is, theory and practice are different, and the reason is percent error, no machine is 100 percent efficient, in this case a person.

I am suspecting you have to little power going to the board itself(Molex's on the motherboard, 28pin+8pin+4pin) or the video card. If it's not posting it also could be that your PSU cannot handle it.

Another thing is that make SURE it is in the first PCIX slot, and that you are plugging in the RIGHT dvi input, dual link sometimes is finicky

Iw ill not see post on my sli setup if i choose the wrong dvi input, other than that my man, I am SoL for ideas

good luck with that!

It's PCIe, not PCI-X... PCI-X and PCIe are totally different. :| Every time i see people make this mistake, it infuriates me..

 

[hynat]

So, I'm out of ideas on this one...
I'm thinking, is it possible to fry a GPU by connecting the EZ-plug to the GPU's 6-pin by mistake?
This means EZ-plug is getting power from the GPU which is also getting poewr from the mobo--cyclical and doesn't make sense.
Because I remeber doing this once by mistake, but I only did this on the first card.
On the second card I initially forgot to plug in the PSU's 6-pin to the GPU, but there's no way this could fry GPU/EZ-plug mobo connector, right?

 

[greenmaji]

How much power you need in watts isnt very decriptive, you can have a powersupply that gives you 500 watts all on the 5V rail and this rig wouldn't boot.
a better question is how many watts does the GPU need all by itself. since it uses 12V you could figure out how many amps you need from that information. Are you using both the 12V rail's out of your PSU? You could try 12V1 for the card
then again you could try a Ocz 520 powerstream/stout single 12V rail PSU (or a rig. that has a stout 12V. PSU) to make sure its not the powersupply.

do you have the manual to the mobo? it should give you the maximum amp draw of the power connectors on the board.

 

[Capt Caveman]

Dumb question. Does the X1900XT fan even running when you power the system-up but no screen POST? How about sticking your 6800GT in the other slot with your X1900XT installed then connect monitor to each one and see what happens?

 

[Mday]

if you're using the the 6 pin PCIe power to the card, the 4 pin power should not be plugged into the motherboard (the one near the blue pcie slot).

i looked at the x1900xt card on newegg, and there is no 3 pin power socket anywhere near the 6 pin pcie power socket. The 3 pin power socket is all the way on the other side of the card, where the fan on the card is plugged in.

 

[hynat]

Yes, the GPU fan turns on and runs fine. I tried sticking in the 6800 and the x1900xt in both slots but didn't get signal from both. Maybe there's a BIOS setting I have to toy with?

I just went to Fry's to return one GPU and one of the technicians said the X1900XTs don't work in A8N32-SLI Deluxe, because I'm trying to use a CrosFire card in an SLI board. I read on here that this is not the case. They work together beautifully.
So what was this guy thinking?
I understand the CrossFire EDITION of X1900XT won't work in this, but this isn't CF Edition. It's CF-READY.

Anyway, I got an A8R-MVP (crossfire board) to see if this would work. Will report shortly.

 

[Gagan]

Don't listento that idiot

Aww man why'd you get the MVP, It's horrible. You just sacrificed 2 16x lanes for a board that has problems.

The a8r32 mvp is a bit better but the a8n32 sli is still better than both

Never listen to a mom and pop fry techie, shoddy business practices, wouldn't be surprised if they had shoddy techs.

 

[hynat]

Sigh!
The a8r-mvp doesn't seem to work with the card either.

Again, works great with GeForce 6800 GT.

I noticed something slightly different this time though--the power switch works fine with the geforce plugged in but somehow for the x1900xt, it works only for powering it up, but then it doesn't shut down if I press again.
What does this mean...

 

[Gagan]

you have to hold the powerbutton
some motherboards have the 4 second rule in bios

 

[hynat]

Update on this problem:

I went ahead and got the 7800 GT SLI. It works, as I was sure it would.
I still can't figure out why the x1900xt won't work in the mobo.
But given this horrible experience, I doubt I'll ever get an ATI card again... I've always preferred the geforces, but this time the x1900xt was too good to passup.

 

[Tsuwamono]

well i know this might be a stupid question but ATI asks that you Connect the GPU to the PSU THEN to a HDD all on the same cable.. did you do this?

Also could be the PSU because my friend had a 450 Watt for his X800 and that wasnt even enough. once he got the 500 watt in there it worked perfectly. So try a 600 watt powersupply and see if that works.

 

[hynat]

Why would I use the GPU lead for HDD also? PSU had dedicated leads for GPUs. But no, I didn't try this.

I tried an Antec NeoHE 550 with bare minimum power connected and didn't work, so I really doubt its the PSU.

 

[t3h l337 n3wb]

It's not the PSU. The S12-500 is an excellent PSU that can power a ton of stuff. This sure is a weird problem...