Help, wold my PSU be powerful enough for crossfire

[LordAzathoth]

Hi guys
I was thinking of buying 2 5850/crossfire
I've got an antec Truepower 650W (new one)

here's what OCuk says about it
NVIDIA™ SLI™ - ready certified
- 80PLUS® Bronze Certified saves energy and lowers your electric bill
- DC to DC voltage regulator modules for greater system stability
- 120mm PWM fan runs up to 50% quieter than standard fans
- Advanced Hybrid Cable Management improves airflow and reduces clutter
- Double layer PCB optimizes cooling efficiency and allows for heavy duty components
- Universal Input and Active Power Factor Correction
- Supports dual GPUs and dual/quad core CPUs
- 4 +12V output circuits provide stable power
- ATX12V v2.3 and EPS12V v2.91
- 1 x 6 pin and 1 x 8 (6+2) pin PCI-E graphics card connectors for TP-550
- 2 x 6 pin and 2 x 8 (6+2) pin PCI-E graphics card connectors for TP-650, TP-750 and - Industrial grade protection
- Safety approval: UL, CUL, CE, CB, FCC Class B, TUV, CCC, C-tick, BSMI
- Dimensions: 86mm (H) x 150mm (W) x 150mm (D)


I've got 2 sata hdd 1dvdrw wanting to OC my X6 1090t 2x2gig ddr3

thanks for your help!

 

[Grimley]

It should be.

 

[SouthEastBlue]

Should probably be OK, but it's a little borderline I would imagine.

 

[Jony27]

it should be.
do you already have one of the hd5850 or do you still have to buy both of them?
if you still have to buy both of them then i would certainly wait and see what the 69xx are like, if its too pricey then i would think of 2xhd6870 instead.

 

[LordAzathoth]

no haven't got them, I'm waiting a week for the 6900 series to come out

 

[cmndr_andi]

That PSU will be absolutely fine with a Phenom II X6 + 5850CF system.

This test (second graph) show that a 5850 CF system (with a 3.33GHz i7) only needs 550W at maximum load.

 

[LordAzathoth]

That PSU will be absolutely fine with a Phenom II X6 + 5850CF system.

This test (second graph) show that a 5850 CF system (with a 3.33GHz i7) only needs 550W at maximum load.

Yeeeeeeeeeeepeeee

thanks mate!

 

[LordAzathoth]

550W is not the Power consumption of the gpu only....?

 

[Jony27]

550w is power consumption of the full system

hmm,,i could be wrong...... someone clarify this?

 

[cmndr_andi]

550W is not the Power consumption of the gpu only....?

Nope, as it says on the graph 550w is for the "Total system power in Watts". This page shows what is in the rest of the test system.

 

[RJC]

When I had crossfire 5850 & Overclocked i7 this pulled 430w~ from the mains at full load.

 

[LordAzathoth]

yes you're right total power..hmm,why are all these power consumption tend to say I need 750...

 

[cmndr_andi]

What is telling you that you need 750W?

If it is a AMD, then that is mainly to account for sub-standard power supplies that flood the market. Many of these models can't really supply their rated power, so AMD overspecify to ensure that their hardware will definately receive sufficient power. However, your PSU is a high quality one that can definitely provide the rated power - so you won't have any issues.

If you would like a sensible power calculator - I find this one produces good results.

 

[Danny862]

Use eXtreme Power Supply
Calculator

www.extreme.outervision.com/psucalculatorlite.jsp

Type in all of your spec and it will give you a basic idea

 

[LordAzathoth]

thank you for your answer that link is good! they don't have my cpu but I'm sure it doesn't make a big difference.

I've realised I was doing it wrong I put more than 1 in number of CPU....always below gives me 530w with an X4 940... so seems I've got headroom for OCing

 

[Danny862]

it is not 100% accurate but it is very usefull
glad to hear its all working