sapphire HD4870 X2 pci-e slot problem

[nickmo2]

Hi all
i wonder if anyone can help with a problem i cant seem so sort out

I have rebuilt my old system into a new case. I was running

asus blitz extreme
qx9770
2x Asus 3870x2 cards in crossfire
4gb corsair dominator 1600mhz ram (did have 8gb but runs better with 4)
termaltake toughpower 1475 watt psu

build went well installed fresh copy of win 7 64bit no probs
wanted to upgarde graphics cards so bought 2 sapphire HD4870 x2 cards cheap off ebay (money but tight atm due to tarting up my house).

i put both 4870x2,s in connected correct power connectors and started up. instantly 1 short beep followed by 2 longer beeps. powered down took bottom card out booted to windows fine. I then tried putting a asus U3S6 sata3 adapter card in second pci-e slot. Same thing 1 short 2 long beeps

I have tried another blitz extreme MB and swapped ram about every combination of pci-e cards boots ok including my original 3870's

as soon as i put 1 of the 4870x2 in either slot the other slot gives beeps

i looked long and hard for an answer sorry if this already been answered

thanks for any help i get
Cheers Nick

 

[borisvodofsky]

Did you make sure to plug in the power connectors on the card, the 6 pin, or 8 pin.


the 4870x2 uses TONs of power, so your power supply might not be able to handle it.

We're talking like 800 watt psu for 2x 4870x2 + CPU

 

[lavaheadache]

what are you doing with the 3870x2's ?

 

[T_Yamamoto]

Did you make sure to plug in the power connectors on the card, the 6 pin, or 8 pin.


the 4870x2 uses TONs of power, so your power supply might not be able to handle it.

We're talking like 800 watt psu for 2x 4870x2 + CPU

he has a 1475 watt psu

 

[nickmo2]

Both 6 and 8 pin connectors are plugged in

i can use pc fine as long as i dont use other pci-e slot
as soon as anycard goes in other slot get the beeps and no video
but pc boots up fine ( i hear start sound ) i just have no screen :'(

 

[VirtualLarry]

I remember DFI's X38/48 boards had issues with the ATI X2 cards, running in CF. It required a BIOS fix. I wonder if some similar issue is at work here?

 

[borisvodofsky]

Well if you're sure the power is not the issue, it's gotta be the bios.

I'm assuming you stress tested both cards.


According to the ASUS website


Blitz Extreme BIOS 0804
1. Enhance PCIe VGA card compatibility
This was 2007.08.14 , You probably have it then. hmm..