What PSU do you use with a 4 GPU rig?

Dyaheon

member

Activity: 121

Merit: 10

Quote from: Mabsark on June 24, 2011, 02:05:07 AM

Quote from: PandaMiner on June 24, 2011, 12:45:04 AM

Quote from: Mabsark on June 23, 2011, 09:54:04 PM

So why couldn't you just use a 6 pin PSU to 6 pin PCIE cable directly,...

I don't know why you are not getting it. Here's a picture.

I don't KNOW if "they" make a 5pin-molex to 6/8pin-PCIe power cable. But if not, then one must use an adapter in conjunction with a 5pin-psu(molex) cable.

I've never seen those 5 pin peripheral sockets before. All the modular PSUs I've seen use 6 pin peripheral connectors that look just like 6 pin PCIE plugs.

Mine looks like that, all slots are identical. I suppose with a PSU like that, you could try to acquire more cables instead of using molex->6pin adapters. However, it's easier to use adapters than acquire more pci-e cables

PandaMiner

sr. member

Activity: 322

Merit: 250

Quote from: melco on June 24, 2011, 04:46:56 AM

Why not to use Y-slitter to split 6pin PCIe to 2*6pin PCIe?

As I stated in the OP, Y-splitters are not recommended by the video card manufacturers. That, and I don't have any. Tongue

melco

member

Activity: 62

Merit: 10

Quote from: PandaMiner on June 23, 2011, 08:47:44 PM

Well, I guess the only difference is that you would need a 4pin-Molex-to-6/8pin-PCIe modular cable. Not sure if they make those.

I think they make molex-to-6/8pin adapters. You could use an adapter with a molex-to-molex cable.
This would be a perfect solution.

Why not to use Y-slitter to split 6pin PCIe to 2*6pin PCIe?

Mabsark

legendary

Activity: 826

Merit: 1004

Quote from: PandaMiner on June 24, 2011, 12:45:04 AM

Quote from: Mabsark on June 23, 2011, 09:54:04 PM

So why couldn't you just use a 6 pin PSU to 6 pin PCIE cable directly,...

I don't know why you are not getting it. Here's a picture.

I don't KNOW if "they" make a 5pin-molex to 6/8pin-PCIe power cable. But if not, then one must use an adapter in conjunction with a 5pin-psu(molex) cable.

I've never seen those 5 pin peripheral sockets before. All the modular PSUs I've seen use 6 pin peripheral connectors that look just like 6 pin PCIE plugs.

gmannn

full member

Activity: 148

Merit: 100

Quote from: PandaMiner on June 24, 2011, 12:49:43 AM

Quote from: gmannn on June 23, 2011, 10:54:34 PM

a 35 dollar PSU, 600 watts. powering 2x 5830 and 2x 5770 for a total 1ghash.

How are you powering the four cards? The specs I read show only 2 x PCIe 6+2 cables. You must be using adapters.

Yes the built in pcie cables power the 5830s (2 plugs each card), and I use 2-molex>1-6pin adapters that came with 5770s to power them. the 5770s only need a single 6pin.

CanaryInTheMine

donator

Activity: 2352

Merit: 1060

between a rock and a block!

Quote from: PandaMiner on June 24, 2011, 01:28:12 AM

Canary, So you are using TWO rigs to get your 1ghash?

'Cause if you're not using adapters, and your PSU only has four cables (two 6pins, and two 6+2pins), then it can only support two physical cards (not counting on-board GPUs).

I think you are confusing me with gmannn... and it would be very easy to power his setup... 5830's are clearly covered...

5770 only needs 1 6-pin. it would be very easy to convert 4 pin molex to 6 pin. The PSU gmannn is referring to is fully capable of his setup.

Also, cards typically include such molex converters etc... Don't confuse this with Y-splitters...

Hope this helps.

PandaMiner

sr. member

Activity: 322

Merit: 250

Canary, So you are using TWO rigs to get your 1ghash?

'Cause if you're not using adapters, and your PSU only has four cables (two 6pins, and two 6+2pins), then it can only support two physical cards (not counting on-board GPUs).

CanaryInTheMine

donator

Activity: 2352

Merit: 1060

between a rock and a block!

Quote from: PandaMiner on June 24, 2011, 12:49:43 AM

Quote from: gmannn on June 23, 2011, 10:54:34 PM

a 35 dollar PSU, 600 watts. powering 2x 5830 and 2x 5770 for a total 1ghash.

How are you powering the four cards? The specs I read show only 2 x PCIe 6+2 cables. You must be using adapters.

better details here:

2x6 and 2x(6+2) connectors

PandaMiner

sr. member

Activity: 322

Merit: 250

Quote from: gmannn on June 23, 2011, 10:54:34 PM

a 35 dollar PSU, 600 watts. powering 2x 5830 and 2x 5770 for a total 1ghash.

How are you powering the four cards? The specs I read show only 2 x PCIe 6+2 cables. You must be using adapters.

PandaMiner

sr. member

Activity: 322

Merit: 250

Quote from: Mabsark on June 23, 2011, 09:54:04 PM

So why couldn't you just use a 6 pin PSU to 6 pin PCIE cable directly,...

I don't know why you are not getting it. Here's a picture.

I don't KNOW if "they" make a 5pin-molex to 6/8pin-PCIe power cable. But if not, then one must use an adapter in conjunction with a 5pin-psu(molex) cable.

gmannn

full member

Activity: 148

Merit: 100

http://www.amazon.com/Diablotek-600-Watt-Power-Supply-PSDA600/dp/B003UWNL2O

a 35 dollar PSU, 600 watts. powering 2x 5830 and 2x 5770 for a total 1ghash.

Underclocked single core sempron, no hard drives. running linuxcoin via usb stick and 3x fans to keep things below 70c.

Mabsark

legendary

Activity: 826

Merit: 1004

Quote from: PandaMiner on June 23, 2011, 08:47:44 PM

Well, I guess the only difference is that you would need a 4pin-Molex-to-6/8pin-PCIe modular cable. Not sure if they make those.

I think they make molex-to-6/8pin adapters. You could use an adapter with a molex-to-molex cable.
This would be a perfect solution.

So why couldn't you just use a 6 pin PSU to 6 pin PCIE cable directly, instead of a using a 6 pin PSU to 4pin molex cable combined with a 2 molex to PCIE adaptor? That's what I don't get and it seems extremely odd to me. If you can use the molex adaptors, then you should just be able to replace the whole molex cable with a PCIE cable.

PandaMiner

sr. member

Activity: 322

Merit: 250

Well, I guess the only difference is that you would need a 4pin-Molex-to-6/8pin-PCIe modular cable. Not sure if they make those.

I think they make molex-to-6/8pin adapters. You could use an adapter with a molex-to-molex cable.
This would be a perfect solution.

Mabsark

legendary

Activity: 826

Merit: 1004

Quote from: PandaMiner on June 23, 2011, 07:28:14 PM

Quote from: Mabsark on June 23, 2011, 01:48:26 PM

If you've got a modular PSU and not enough PCIE cables, couldn't you just buy more cables?

No, not really. When you buy a modular PSU, it comes with ALL cables it can handle. So, the X4 1200w, for example, supports 6 6/2-pin cables, and includes 6 6/2-pin cables. (That's 3 video cards)

If you need 2 more, you will need a converter to/from a molex, apparently.

So, whats the difference between adding an extra molar cable and adding an extra 6-pin PCIE cable?

PandaMiner

sr. member

Activity: 322

Merit: 250

Quote from: Mabsark on June 23, 2011, 01:48:26 PM

If you've got a modular PSU and not enough PCIE cables, couldn't you just buy more cables?

No, not really. When you buy a modular PSU, it comes with ALL cables it can handle. So, the X4 1200w, for example, supports 6 6/2-pin cables, and includes 6 6/2-pin cables. (That's 3 video cards)

If you need 2 more, you will need a converter to/from a molex, apparently.

Mabsark

legendary

Activity: 826

Merit: 1004

If you've got a modular PSU and not enough PCIE cables, couldn't you just buy more cables?

Whiplash450

newbie

Activity: 182

Merit: 0

Quote from: max in montreal on June 22, 2011, 11:13:37 PM

Quote from: Whiplash450 on June 22, 2011, 08:30:31 AM

I'm running a system with 4 x 6970 (which require 1 8pin & 1 6pin each) and I'm using a Silverstone Strider 1500W. The PSU has 4 pcie cables with a 6+2pin and a 6pin.
My motherboard is an MSI 890FXA-GD70 for AM3 socket, that has 5 pcie slots(but 4 that can be used with a 1 slot gap for dual-slot GPU cards) and my case has 8pci expansion slots on the back.
So its fairly easy to run a 4 card setup even if those cards are dual slot.

What case are you using?

I'm using the In Win Ironclad ~100 euros from Amazon although I've seen it cheaper if you are prepared to look around a bit.

The cables on the Silverstone 1500W are about 50cm long and probably good enough for any top/bottom mount config that you could think of. Only problem is that the PSU is very expensive ~280 euros.

rograz

hero member

Activity: 575

Merit: 500

Running 4x Sapphire 5850 Xtreme on a corsair 650 TX perfectly stable pulling 630W(around 85% eff) from the wall so there is still some headroom. I wouldnt try it with any other 5850s tho since the Xtreme cards seem to pull about 15-20w less than other 5850s.

melco

member

Activity: 62

Merit: 10

Quote from: PandaMiner on June 23, 2011, 02:29:02 AM

Quote from: melco on June 23, 2011, 02:28:25 AM

I use MSI 790FX-GD70 Socket AM3, that also has 5 pcie slots (4*x16,1*x1 physical size). Also I use 2xChieftec APS-800C connected with each other on green powerOn signal cable and black ground cable. Works like a magic.

Very nice. That's a $200 board, right? D= DrMos, G= Gamer (orange box). OR am I thinking of the 870A-GD70?

Nope. This one. Got two such for 86$ each (I live in Ukraine. They are still available for order).
All except GPUs: Mobo 86$ + CPU AMD Sempron 140 36$ + Kingston DDR3-1333 1024MB PC3-10600 (KVR1333D3N9/1G) 13$ + 2* Chieftec APS-800C 123$ = 381$ total

PandaMiner

sr. member

Activity: 322

Merit: 250

Quote from: melco on June 23, 2011, 02:28:25 AM

I use MSI 790FX-GD70 Socket AM3, that also has 5 pcie slots (4*x16,1*x1 physical size). Also I use 2xChieftec APS-800C connected with each other on green powerOn signal cable and black ground cable. Works like a magic.

Very nice. That's a $200 board, right? D= DrMos, G= Gamer (orange box). OR am I thinking of the 870A-GD70?

Quote from: CanaryInTheMine on June 22, 2011, 11:20:45 PM

TJ11. got it cheap and love it.

How much is cheap? I hear these suckers go for $600 to $700!

Topic: What PSU do you use with a 4 GPU rig? (Read 10975 times)