HD6870 and XFX 450W

[pamark]

Hello,

is XFX 450W enough for:

i5 750 stock
4 GB DDR3
Sapphire HD6870
1 500GB Hard Disk
1 80mm case fan

it has 34 Amps on 12v rail
or I should take XFX 550W

I'm not planning on doing any overclocking.

Thanks

 

[sportsfanboy]

If your not going to be overclocking and adding a ton of extra parts, I would say it's enough power. That said the 550w might be better so you have more room to spare for future upgrades and some overclocking if you feel like it.

 

[gaborbarla]

Hello,

is XFX 450W enough for:
...
or I should take XFX 550W

Thanks

I had a two year old 530W powersupply and it blew up (with smoke and brimstone smell ) after about 2 months of usage.
I have an i7 2.93 (Not O/C), an ATI 5870 1gb RAM, 4GB RAM and two Harddrives and an EMU sound card.

It is good to get a PSU that is at least 80% efficient (less heat and less power wasted)
PSUs tend to become less and less efficient and losing some 20% over a few years of usage, this varies with the load they are put under.
The more the PSU is pushed the faster it degrades.

So a 450W power supply, will actually degrade to around 350W over time, which is definitely less than you will need.

Also most power supplies advertise their max output, not counting the +-20% they lose to heat. Effectively this could lower a 450W to 360W (at the day of purchase). This will further degrade over time depending on load and age. (I am unsure which XFX power supply this is, but it is good to read up on max output before purchase and aim 30% above what is needed for longevity)

I purchased quality FSP 700W power supply to replace my old PSU, I think you should think about getting a 600W+ to have a system that is quiet and reliable.

 

[yummerzzz]

@Gaborbarla

That XFX is an 80Plus bronze 450W CPU, made by seasonic, with 34A on the +12V Rail, it has as much power as the CX500 power supply by corsair, which is sold as a 500W power supply, he defiantly does not need a 600W power supply, and that 530W PSU you had was most likely a generic non-80+ PSU.

The HD 5870 is MUCH more power hungry than a HD 6870 also.

@OP

Go for it, I made this exact thread maybe a week ago, and I got the go ahead to build with it.

 

[julius 85]

@Gaborbarla

That XFX is an 80Plus bronze 450W CPU, made by seasonic, with 34A on the +12V Rail, it has as much power as the CX500 power supply by corsair, which is sold as a 500W power supply, he defiantly does not need a 600W power supply, and that 530W PSU you had was most likely a generic non-80+ PSU.

The HD 5870 is MUCH more power hungry than a HD 6870 also.

@OP

Go for it, I made this exact thread maybe a week ago, and I got the go ahead to build with it.

Yes, it is a rebranded S12II with a lot worse voltage regulation and ripple suppression. The 550W is better than the 450W model but you would be better off buying the actual S12II from Seasonic IMO.