Graphic Cards Query on EVGA PSU Recommendation (Solved: GTX 660 Tested)

[kidrow]

Hi,

EVGA recommends a minimum 400w PSU with a minimum of 24amps on the 12v rail for the Gtx 550 ti here. Now for Gtx 650 ti Boost here, it recommends a minimum 450w PSU with a minimum of 24amps on the 12v rail.

So my understanding is that both cards will require a minimum of 288 watts (24*12) on the 12v rail as per the specs. So why does EVGA recommend a 400w PSU for one & 450w for the other? What I'm basically trying to understand is shouldn't the same PSU work for both?

Thanks.

 

[topgear]

a good quality 400W psu should power GTX 550 Ti and 650 Ti boost both deoending on the cpu and other componenets .. what most of the manufacturers do is they just recommend a generic PSU requirement so if you know your pc's power consumption then you are even good with a good quality 400/450w psu but having provision for more power in hand is always better

 

[kidrow]

Hello & thanks for the reply. Yeah, I was just confused about whether there is something else that needs to be factored in that is the reason for the different watt output recommendation. I guess they just went for the higher no. for the better GPU, . Cheers.

 

[kidrow]

Just an update in case anyone else happens to stumble across this thread in the future -
Have bought an EVGA gtx 660 (non-ti) & the FSP Saga 2 400w PSU seems to handle it fine. At stock settings, I've run the Uniengine Heaven benchmark for about 3 hours straight, the MSI Kombustor for about 80mins & rendered a scene with the iRay renderer (within 3ds max) for 5 hours straight, without any issues. The latter stresses both the GPU & the CPU, so I think it's safe to say that the system is stable.
Rest of the specs are - i5 2400, 2x4gb Ram, 2 7200rpm hdds, no additional fans.
Cheers,