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Is the PSU big enough?

Last response: in Systems
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August 31, 2009 6:45:31 PM

Hi all.. i've just ordered my new PC today

CPU: AMD Phenom II X4 955 - 3.2Ghz
CPU Cooling: OCZ Vendetta 2 (Didnt order since it was not in stock but gonna do next time)

GFX: XFX Radeon HD 4870 XXX - 1GB GDDR5 SDRAM
GFX Cooling: Arctic Cooling Accelero S1 Rev. 2 -
PSU: Corsair TX Series 650 Watt
Mobo: Gigabyte GA-MA770T-UD3P
RAM: Corsair XMS3 DHX 2x2GB - 1333 MHZ - PC10666
Case: Antec Three Hundred

Later on im gonna buy an 10k RPM harddrive and put it as the system disk for faster loading times and put the 500gb Caviar disk which i've bought as slave..

Anyway i had a discussion earlier with a guy saying that 650 Watt was NOT enough to run this system and i should as minimum get a 750 Watt but 850 Watt would be the best, especially if i wanted to overclock a little..

So what do you say, is 650 watt enough or should i get 750/850?

More about : psu big

a b à CPUs
August 31, 2009 7:03:08 PM

the 650 will be fine 750 only for crossfire/sli setups mostly unles you wanna add another 4870 even a good 550 watt would cope well with a single card and on the 10k drive assuming velociraptor right the newer 7200 drives will match it some even surpass it
a c 77 à CPUs
August 31, 2009 7:04:43 PM

The 650TX is PLENTY for that system. Whoever told you it wasn't enough shouldn't be giving advice.
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a b à CPUs
August 31, 2009 7:06:55 PM

Yes that's actually more than you need, but it's a very good quality PSU that is also quiet. It will cover any single GPU for some time to come.
August 31, 2009 7:07:45 PM

Well he told me that he had been looking on some Crysis benchmarks and that the GFX alone used around 330 Watt running it.. And yeah im planning on getting the Velociraptor 10k 300gig next month or so, and then partition it into 2 or 3 i think..
a b à CPUs
August 31, 2009 7:41:52 PM

330W would be about right for the total system draw on some machines, including yours. A 4870 by itself is going to pull under 200W. The 4870X2 DOES pull around 330W however. Once you factor in efficiency and longevity about the max you would need on your system would be about 550W. Probably about what I would recommend.

Again, nothing wrong with the 650TX, it's a fine PSU.
a c 172 à CPUs
August 31, 2009 7:50:30 PM

A normally clocked 4870 will pull about 11 - 12 amps. An OC'd CPU - no more than 10 amps. That leaves about 30 amps for the rest of the system. Plenty of power.
August 31, 2009 8:30:10 PM

Proximon said:
330W would be about right for the total system draw on some machines, including yours. A 4870 by itself is going to pull under 200W. The 4870X2 DOES pull around 330W however. Once you factor in efficiency and longevity about the max you would need on your system would be about 550W. Probably about what I would recommend.

Again, nothing wrong with the 650TX, it's a fine PSU.



Oh okay, so well from what he told me the GFX alone would use around 330watt's just to pull of Crysis, and then the CPU, mobo and the rest of the hardware would need their watts to run too..

But as i understand it from what you write, the WHOLE system including GFX, mobo, cpu, etc would use only 330watt's for running crysis, of course the settings would make the cpu/gfx work harder and then use more watt's?
August 31, 2009 8:41:53 PM

Ah yeah i see that a HD4870 pulls 184 Watt's on 3D Full Load Watts (Sockets) so i should be pretty safe i guess :D 
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