Suitable PSu for 2x8800 GTX, enough leads ?

NickBow · 29 Aug 2008 at 14:43

I have just bought a 2nd 8800gtx and as expected I am going to have to upgrade my PSu as it is only 750w but it also only has 3, 6 pin PCI-e power connectors and I now need 4. So my question is: Dose the Akasa AK PO85FG-BK 850w PSu that OC’s is selling have enough power cables to run both cards ?

My MB is a : Asus M2N32 Deluxe Wireless Edition
CPU : AMD Athlon 64 X2 6000+
RAM : OCZ Technology 1GB 240DIMM PC2-6400 DDR2 Gold x4
OS : Vista home premium SP1

Thanks in advance

MeatLoaf · 29 Aug 2008 at 14:47

Couldnt you use a 2 molex to pci-e 6pin adapter?

NickBow · 29 Aug 2008 at 14:50

I dont know ? the existing PSU is a Thermaltake 750 watt W0116RB, if I could use one of those (I think it's an adapter that turns one into two?) then it's probably cheaper than a new PSU ?

MeatLoaf · 29 Aug 2008 at 14:56

Yeah you could try it, i would if it were me.

willhub · 29 Aug 2008 at 15:00

PSU should be fine, the PCI-E - molex connectors are fine to use

NickBow · 29 Aug 2008 at 15:03

Will I loose any performance ? thanks for your help so far !

{SAS}TB · 29 Aug 2008 at 15:10

I use a 720W for my rig (spec in sig) including 2 x 8800GTXs and its fine - I even had it running on a 620W recently while the PSU was RMAd.

While I had *** 620W hooked up i was using 2 molex adapters and all was fine

NickBow · 29 Aug 2008 at 15:11

thank you guy's ! you've just saved me £100ish *buys all a pint*

willhub · 29 Aug 2008 at 15:17

NickBow said:
thank you guy's ! you've just saved me £100ish *buys all a pint*

Dont forget to send the pint 1st class and make sure it dont go off

*Emails address*

EsaT · 29 Aug 2008 at 18:30

NickBow said:
I dont know ? the existing PSU is a Thermaltake 750 watt W0116RB

ToughPowers are good PSUs.
(unlike some other Thermaltakes)

8800GTX is ~132W, CPU about 100W so I would say total peak consumption to be around 400W, 450 at most.

NickBow · 1 Sep 2008 at 12:31

So, I found a molex - PCIE connector that came with the mobo and plugged them in but I noticed that only 5 out of the 6 holes had conections in with one being empty:
000
0X0 (where X is empty)
Installed the drivers enabled SLI, ran 3d Mark. Fine.
Played COD4 for about 5-10mins max, freezes up and needed to manualy restart. happend 3 - 4 times so stopped playing.
I'm doing an Fdisk and clean install of Vista (currently running XP SP 2 atm) tonight but I'm thinking that it's the connector cable as all drivers are up to date ?

foxbat · 1 Sep 2008 at 12:36

What are your temperatures like (CPU/case/GPU) during the game?

NickBow · 1 Sep 2008 at 12:47

Not somthing I checked and will do this evening but there is plenty of air flow through the case.

{SAS}TB · 1 Sep 2008 at 12:56

Just checked one of the adapters that came with my GFX and they are :

6-Pin (clip upward)
__--__
| 000 |
| 0x0 |

With the X being an empty connector

then the 2 Molexs (straight flat edge up)
_______
\ 000x /

With the x being an empty ocnnector

NickBow · 1 Sep 2008 at 13:00

Drivers or overheating then, so much for plug in and play.

MeatLoaf · 1 Sep 2008 at 13:12

Is the card in the top slot a pre overclocked model and the one in the lower slot a standard clock card? If so then the lower card is being overclocked to atch the top card and maybe cant take the overclock. Unlikley tho, have you tried the cards the other way round

NickBow · 1 Sep 2008 at 13:33

neither are overclocked, the 2nd card is the older one, 18 months and the 1st one is less than a week old. Same model diferent manufacturers