Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > Corsair 650w or 750w?
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enarchay   08-08-2009 at 04:33:05 AM

I'm considering upgrading my power supply just so I can have the peace of mind that my PC isn't over exerting itself. But I figure if I'm going to upgrade my PSU, I might as well plan for the future while I'm at it.

My current specs are:

Disk drive - Sony Optiarc DVD Burner with LightScribe Black SATA Model AD-7241S-0B LightScribe Support

Processor - AMD Phenom II X4 945 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor

Motherboard - MSI K9A2 CF-F V2 AM2+/AM2 AMD 790X ATX AMD Motherboard

Video card - MSI R4890-T2D1G OC Radeon HD 4890 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - OC Edition

RAM - OCZ Fatal1ty Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model OCZ2F10664GK

Hard drive - Seagate Barracuda 7200.12 ST3500418AS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive

Monitor - ASUS VH226H Black 21.5" 2ms(GTG) HDMI Widescreen LCD Monitor

Case - NZXT Beta Series CS-NT-BETA-B Black Steel / Plastic ATX Mid Tower Computer Case

Extra fan - 120mm Antec Tricool LED fan

I could see myself in the future adding another hard drive, and possibly another disk drive. But more importantly I want the option of using two 4890 crossfire video cards. So my question is, would a 650w Corsair power supply be sufficient for these future upgrades? Is the 750w really worth the extra 20 or so dollars?

One thing I noticed is that the 650w only comes with 2 PCI connectors. However, video cards come with PCI adapters. The question is whether or not using a PCI adapter rather than a PCI connector straight from the power supply affects quality. Does it?

So what do you think? 650w or 750w? Why?

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cjl   08-08-2009 at 05:46:10 AM

For CF 4890s, I'd be tempted to go for the 750. The 650 would work just fine, but I like to run PSUs at well under their rated spec most of the time. It would also depend on the price difference between the two - if it is fairly small, there's no point to getting the 650, but if it is large, the 650 might be the better choice.

------------------------------ Asus P6T deluxe
i7 965 @ 4.2GHz (200*21), 1.384V
12GB Corsair Dominator DDR3-1600 CAS 7
 Reply to cjl
theAnimal   08-08-2009 at 05:04:34 PM

750 because it has the required connectors for 2 video cards.

------------------------------ *How To Ask For New Build Advice*
HAF 922 | HX750
Rampage2Gene | i7 920 | 6GB Gold 1600 | Hyper 212+
Caviar Black 640GB | 2x GTX260 216
 Reply to theAnimal
jsc   08-08-2009 at 07:49:51 PM

Can't tell if you are going to run 1 video card or 2.

If 1: 650 TX.
If 2: 750TX.

Reply to jsc
volks1470   08-12-2009 at 04:17:49 AM

the 650w only has two 8 pin plugs

the 750 has four 8 pin plugs.

The 4890 has two 6 pin plugs.

The 650w will handle the 4890s but it lacks the connectors.

Message quoted 1 times
Reply to volks1470
hefox   08-12-2009 at 10:28:30 AM

volks1470 wrote :

the 650w only has two 8 pin plugs

the 750 has four 8 pin plugs.

The 4890 has two 6 pin plugs.

The 650w will handle the 4890s but it lacks the connectors.



What are you talking about?!
8 pin plugs for gpu can become 6 pin so 650 W can handle the 4890.

Message quoted 1 times
Message edited by hefox on 08-12-2009 at 10:28:44 AM
------------------------------ Intel i7 920, Gigabyte X58-DS4, 3x1 Corsair DDR3 1333, XFX 260 GTX
Samsung 750Gb F1,Samsung DVD-rw, Hiper Type-M 880W, Coolermaster HAF 932, Logitech Z-5500
 Reply to hefox
theAnimal   08-12-2009 at 10:50:59 AM

hefox wrote :

What are you talking about?!
8 pin plugs for gpu can become 6 pin so 650 W can handle the 4890.


It's for CF 4890s.

------------------------------ *How To Ask For New Build Advice*
HAF 922 | HX750
Rampage2Gene | i7 920 | 6GB Gold 1600 | Hyper 212+
Caviar Black 640GB | 2x GTX260 216
 Reply to theAnimal
hefox   08-12-2009 at 10:55:45 AM

My mistake. Then yes, you need 750W.

------------------------------ Intel i7 920, Gigabyte X58-DS4, 3x1 Corsair DDR3 1333, XFX 260 GTX
Samsung 750Gb F1,Samsung DVD-rw, Hiper Type-M 880W, Coolermaster HAF 932, Logitech Z-5500
 Reply to hefox
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