PDA

View Full Version : Minimum PSU for a Quad Core and a G80 or R600....


Bowen
03-28-07, 09:07 AM
What's the minimum PSU wattage you'd recommend for a system? I'll tell ya what I currently have and what I'm planning on getting. Here's what I have: A64 X2 4400+@2.31GHz, 2GB 4x512MB of PC3200 Corsair ValueRAM, MSI K8N Neo4 Platinum mobo, GF 7800 GTX 512, Sound Blaster X-Fi XtremeGamer Fatal1ty sound card, 1 Lite-On DVD-ROM, 1 Lite-On DVD burner, 1 WD IDE 7200RPM HD, 1 Seagate SATA 7200 RPM, 1 Floppy, 1 Enermax 535 watt PSU, 5 80mm case fans.

Now, here's what I want to build: Core 2 Quad Q6600, 2GB 2x1GB of DDR 667MHz Corsair XMS RAM, G80 or R600 (whichever comes out first), MSI P965 mobo, Sound Blaster X-Fi XtremeGamer Fatal1ty sound card, 1 Lite-On DVD burner, 1 Floppy, 1 WD IDE 7200 RPM HD, 1 SATA Seagate 7200 RPM HD, 5 80mm case fans and I want to use my 535 Watt Enermax PSU if I can. According to this PSU calculator, I'll only need a 408 watt PSU if I buy the G80 (GF 8800 GTX) http://extreme.outervision.com/psucalculatorlite.jsp

My Enermax 535 PSU says on the sticker that is has two 12v rails and they each have 18a. The total 12v amperage is 34a. Is that enough or am I cutting it too close?

Now, do you guys agree with that assessment or should I get a new PSU too? The problem is, I really don't have enough money to buy a new PSU, otherwise, I'd get one in a heartbeat...the PC Power and Cooling Quad 750 watt PSU to be precise for $199 at Newegg, but I don't have the extra $200 or else I would. I'd rather have allot of overhead but I just can't afford it now. Another alternative is getting the E6600 Dual Core, in which case I'll have enough money to buy the PCP Quad 750. Whatever happens I'm waiting until April 22nd where Intel drops their prices on their CPU's so the currently expensive Q6600 will drop down to a more manageable $530.

Xion X2
03-28-07, 10:55 AM
My Enermax 535 PSU says on the sticker that is has two 12v rails and they each have 18a. The total 12v amperage is 34a. Is that enough or am I cutting it too close?

That's not good. Dual-rail power supplies are poorly designed for high-end systems because the first 12v rail is almost always dedicated to the processor. Rail #1 will run nothing but your quad-core, and the rest of your components will be forced to run off 18A. I'd suggest you at least go with a 700W OCZ GameXtreme or FSP Group or something in that class that has more than 2 12v rails. Preferably the PCP&C Silencer 750, but you said that's a little too much. It's a single-rail, but those are okay. You just want to avoid dual-rail PSUs.

You really can't skimp on the PSU. And I don't think it'd be very smart to try and run your Kentsfield/G80 on a 535W dual-rail.

Bowen
03-28-07, 11:08 AM
That's not good. Dual-rail power supplies are poorly designed for high-end systems because the first 12v rail is almost always dedicated to the processor. Rail #1 will run nothing but your quad-core, and the rest of your components will be forced to run off 18A. I'd suggest you at least go with a 700W OCZ GameXtreme or FSP Group or something in that class that has more than 2 12v rails. Preferably the PCP&C Silencer 750, but you said that's a little too much. It's a single-rail, but those are okay. You just want to avoid dual-rail PSUs.

You really can't skimp on the PSU. And I don't think it'd be very smart to try and run your Kentsfield/G80 on a 535W dual-rail.

To be safe, I think I am going to buy a new PSU, someone at another site posted that I could get a refurbished Silencer Quad 750 watt from PCP&C for $169 and it carries the same warranty as a new one. So I'll either buy that one or a lower wattage new PSU from someone like Corsair.

$n][pErMan
03-28-07, 02:24 PM
I suggest my PSU.... SILVERSTONE OP650 ATX12V / EPS12V 650W Power Supply. Its a single rail design and the 12v rail is rated at 54A!!! :D

Xion X2
03-28-07, 02:28 PM
^ Wow, that sounds like a good one if it's single-rail. Good suggestion.