Sign in with
Sign up | Sign in
Your question

Dell Upgrade PSU

Last response: in Components
May 28, 2009 12:55:57 PM

I have just bought a dell XPS 430. It came with a ATI radeon HD 3870 x2 and i have bought another one as a upgrade so i can crossfire them. One problem the PSU is only a 425 watt and ATI recomend at least 550 watt. Dell dont do a bigger PSU. Anyone know a 800 watt PSU that will fit in my pc.

PC Spac::
PREMIUM - Intel® Core 2 Quad Processor Q9550 (2.83GHz, 1333MHz, 12MB cache)

8192MB 1067 MHz Dual Channel DDR3 SDRAM [4x2048]

Hard Drive
2TB Dual Hard Drive Raid 0 Stripe (2x1TB - 7200rpm)

Video Card
Graphics 1GB ATI Radeon 3870 X2 graphics card
(Got a second card cant fit it GRRRRRRR)

Optical Devices
16X DVD+/-RW (Read/Write DVD, CD)

More about : dell upgrade psu

a c 243 ) Power supply
May 28, 2009 8:52:11 PM

No need for an 800 watt psu, you can't Crossfire on that machine.
Related resources
May 28, 2009 9:06:35 PM

yeah delluser1 is right. that computer only has one pci-e x16 slot.
May 28, 2009 9:39:51 PM

Definitely can't CF on that Dell, and you can upgrade to a standard ATX PSU, but you certainly won't need 800W.
May 28, 2009 11:25:33 PM

I have a question for you guys and it's just question, I'm not suggesting anything since I'm not sure of the answer in this case. He has a PCI Express x8 slot as well. Could he CF with that? I understand that he will lose his PCI Express x16 bandwidth and be reduced to PCI Express x8 bandwidth in CF. Would this be possible? Or will it still not work if the board lacks CF support?

Note: All of the boards are the same, some have different CPU's.;rnav
a c 243 ) Power supply
May 28, 2009 11:57:11 PM

A PCIE x16 video card won't fit in a PCIE x8 slot
May 29, 2009 12:09:11 AM

Thanks a bunch DellUser1 for straightening my wires back out. If I would have referred to my notes I would't have asked that silly question, you're the man.

PCIe x1 card in a PCIe x16 slot will run at PCIe x1 speeds

PCIe x16 card in a PCIe x16 slot will run at PCIe x16 speed.

PCIe cards are all backwards compatible, as in a x1,x2,x4,x8 cards will all work in a PCIe x16 slot

x1,x2,x4 will all work in a PCIe x8/x16 slot

x1,x2 will all work in a PCIe x4/x8/x16 slot

x1 will all work in a PCIe x2/x4/x8/x16 slot

A PCIe x16 card will not work in a slot smaller then the physical card, some motherboards will state however they have 2 or 3 x PCIe x16 slots, BUT one or more may only run at x8 speeds, but the physical slot is the same size as x16.
June 10, 2009 11:27:14 PM


I have an XPS 420 too and have a 3870 X2 installed (big mistake! - both going with Dell and AMD).

I was ready to upgrade to a BFG 285 GTX when i noticed this. Aren't Dell breaking some kind of regulation by only putting a 425 Watt PSU in when AMD recommend 550 Watt ( ). This seems like a real swinle. I feel like i have been subject to a con