Corsair 750w or 850w for this build:

[dsc106]

SB-E 3930k, will overclock 25%-30% (to around 4.2ghz)
Corsair H100 (or maybe the H80) liquid cooler
32gb quad channel RAM
eVGA GTX670 with slight OC
Creative X-Fi soundcard

5x 7200rpm HDDs
2x SSDs
1x optical blu-ray
5-6 case fans

Might possibly add more HDDs via a PCI-E controller card, possibly a 2nd GPU or maybe more powerful GPU in future, possible some other add-ons (WiFi card, thunderbolt, etc.) Will be utilizing USB 3.0 bus power in future.

Should 750w PSU by plenty, or any downside (other than price) to swapping out for a 850w PSU for plenty of headroom?

 

[lehtv]

Corsair what? TX, HX, AX?

In any case, just get 850W, the difference in cost hardly matters in the big picture.

 

[dsc106]

Well, I *was* talking about the Corsair AX750 vs AX850..

what is the difference between the TX/HX/AX?

 

[Smoblikat]

Well, I *was* talking about the Corsair AX750 vs AX850..

what is the difference between the TX/HX/AX?

Quality. In the order you said it, I think TX is normal non modular bronze, HX is semi-modular silver, and AX is full modular gold.

Either way, a 650w would be perfectly fine for you, even if you decide to SLI, but get 750 to be safe.

 

[Phishy714]

any of the above mentioned 750w psu's will work perfectly fine, just depends on how much you want to spend and if you need/want a modular psu. They will be fine for overclocked dual 670's too. You can't go wrong with any corsair psu's.

 

[Charlie98]

I've got a TX750v2 in my 2500K build, CPU OC'ed to 4.1GHz, 4 drives, etc, and a 560ti/448... my 750 doesn't even break a sweat. I put the Kill-o-watt on it and I think it may have hit 350w playing MW2.

 

[AkumaX]

I've got a TX750v2 in my 2500K build, CPU OC'ed to 4.1GHz, 4 drives, etc, and a 560ti/448... my 750 doesn't even break a sweat. I put the Kill-o-watt on it and I think it may have hit 350w playing MW2.

I got something similar, but with an Antec EA 380w

 

[White_Ice]

You can't go wrong with a Corsair Unit, i got OCZ but wish i had of got Corsair. Go 850w if you can for extra headroom incase for near future.

 

[lehtv]

Quality. In the order you said it, I think TX is normal non modular bronze, HX is semi-modular silver, and AX is full modular gold.

Well, no. What you're describing are differences in features, not quality. All of them are high quality units in that they're well built, stable, powerful and reliable. The differences are in efficiency and modularity (or degree thereof), plus AX has a semi-passive fan.

I'd rather get XFX XXX edition over Corsair HX, if possible. The specs are very similar but XFX is built by Seasonic and usually costs a bit less.

 

[Smoblikat]

Well, no. What you're describing are differences in features, not quality. All of them are high quality units in that they're well built, stable, powerful and reliable. The differences are in efficiency and modularity (or degree thereof), plus AX has a semi-passive fan.

I'd rather get XFX XXX edition over Corsair HX, if possible. The specs are very similar but XFX is built by Seasonic and usually costs a bit less.

I agree about XFX being better. but id say that an AX850 is of higher build quality than a TX850.

 

[Makaveli]

Quality. In the order you said it, I think TX is normal non modular bronze, HX is semi-modular silver, and AX is full modular gold.

Either way, a 650w would be perfectly fine for you, even if you decide to SLI, but get 750 to be safe.

I'm not sure 650watts would be a good idea for a SB-E system with SLI and that many hard drives it would be doable but I would prefer alittle more head room. The good thing about the AX series is the fans shuts off when at low load also.

I agree 750watts to be safe and if you don't care the price difference isn't huge to go up to the 850.

 

[dsc106]

So 750w is perfectly comfortable even if I expand to SLI.

Sounds like people love the Corsair AX series but some people say the XFX PSU's are better? Pretty much a toss-up?

I could go 850w if I didn't care about the $$, but it would just be wasted it sounds like. Would having the extra wattage cause me any negative downsides in efficiency or PSU lifespan by not being at enough load? Or would it just be wasted money?

 

[Makaveli]

So 750w is perfectly comfortable even if I expand to SLI.

Sounds like people love the Corsair AX series but some people say the XFX PSU's are better? Pretty much a toss-up?

I could go 850w if I didn't care about the $$, but it would just be wasted it sounds like. Would having the extra wattage cause me any negative downsides in efficiency or PSU lifespan by not being at enough load? Or would it just be wasted money?

This would depend on the video cards what is the full load power of two 670 cards in SLI?

And I don't think going up to 850 would be a waste with PSU's its generally better to have slightly more power than you need to. The PSU it will sit at a comfortable 50-70% load. You don't want to buy a 850 for a system that pulls 800 watts. what you are reffering to is overkill those people that have systems that maybe pull 500 watts yet they are buying 1200 watt psu's.

What are the psu prices in your region for the models you are looking at?

 

[dsc106]

It'd be $50 more for an AX850, I don't care about the price difference at all. I've just heard people say that my system is pulling 400watts and the 750w is nowhere close to full load?

Not trying to save money, just don't wanna blow it. It seems most people are saying "don't get the 850w" but I have no problem moving up a step

 

[Phishy714]

It'd be $50 more for an AX850, I don't care about the price difference at all. I've just heard people say that my system is pulling 400watts and the 750w is nowhere close to full load?

Not trying to save money, just don't wanna blow it. It seems most people are saying "don't get the 850w" but I have no problem moving up a step

Honestly, it sounds like you have your mind made up hehe. If you don't care for the extra $50, then getting the AX850w and call it a day. Its a terrific PSU and will serve you very, very well. Like everyone has said, 750W is going to be PLENTY for your needs, so you can go with that as well. Neither of them will degrade any more than the other, or go bad any faster or anything, it just depends on what you NEED.

Do you NEED 850W? No, but at the same time, it would be nice in case you wanted to upgrade to something that requires more power later on - you won't have to worry about your PSU.

 

[dsc106]

Haha yeah no mind made up, just wanted to make sure people weren't trying to save me money, I'd rather spend a bit more and be covered. That said if 750w is more than sufficient if I add SLI and end up running another 6 HDDs internally and max all USB 3.0 parts and OC and upgrade to an IVB-E 8-core processor in 2013, I am totally cool with the 750w, no reason to blow cash

 

[Smoblikat]

So 750w is perfectly comfortable even if I expand to SLI.

Sounds like people love the Corsair AX series but some people say the XFX PSU's are better? Pretty much a toss-up?

I could go 850w if I didn't care about the $$, but it would just be wasted it sounds like. Would having the extra wattage cause me any negative downsides in efficiency or PSU lifespan by not being at enough load? Or would it just be wasted money?

If you run it at <20% load then it will go out of spec, so get 750w because too many watts can be bad too. Dont get corsair, they are too overpriced and are no longer top quality, get this:
http://www.newegg.com/Product/Produc...82E16817703027
Seasonic Quality without the pricetag. XFX is seasonic also, though it might be more expensive and not silver rated. Antec is another high quality, low price PSU, but they arent as good as corsair for quality. Any one of these brands will do you fine, and of course if you want top shelp youll have to pay top dollar (seasonic). Brands to avoid are coolermaster, raidmax, OCZ, kingwin, ultra, basically anything thats not Antec, corsair,PCPnC,Seasonic, or XFX. Even rosewill can have some good PSU's, but generally those are only in the ultra high wattage ones.

Also, 750w would be perfect for now and later upgrades. I cant think of anything that will max that out (as long as you use two GPU's). Youll be covered with anything you throw at it.

 

[lehtv]

^ Mm excellent find, $73 AR AP for a silver rated 750W Seasonic with 7-year warranty. Seriously good deal. Half the cost of AX750 and the only practically significant difference is modularity.

 

[Makaveli]

If you run it at <20% load then it will go out of spec, so get 750w because too many watts can be bad too. Dont get corsair, they are too overpriced and are no longer top quality, get this:
http://www.newegg.com/Product/Produc...82E16817703027
Seasonic Quality without the pricetag. XFX is seasonic also, though it might be more expensive and not silver rated. Antec is another high quality, low price PSU, but they arent as good as corsair for quality. Any one of these brands will do you fine, and of course if you want top shelp youll have to pay top dollar (seasonic). Brands to avoid are coolermaster, raidmax, OCZ, kingwin, ultra, basically anything thats not Antec, corsair,PCPnC,Seasonic, or XFX. Even rosewill can have some good PSU's, but generally those are only in the ultra high wattage ones.

Also, 750w would be perfect for now and later upgrades. I cant think of anything that will max that out (as long as you use two GPU's). Youll be covered with anything you throw at it.

The reason I would recommend the AX and I do actually own one as you can see in my sig is it comes with a 7 year warranty do any of those other PSU come with a warranty that long? That was the tipping point for me in my buying decision!

*Update* I didn't see the post above that is a good deal

 

[Phishy714]

Agreed, that is a GREAT deal if modularity is not important to you. If this is going to go in that big case, modularity is not a big deal cause you will have ALOT of space. Awesome deal.

 

[malikq86]

750 should be enough for that...670 doesn't require a lot of power.

 

[Mem]

The reason I would recommend the AX and I do actually own one as you can see in my sig is it comes with a 7 year warranty do any of those other PSU come with a warranty that long? That was the tipping point for me in my buying decision!

*Update* I didn't see the post above that is a good deal

I have two very old Enermax PSU's going strong,well pass their 3 year warranty and coming up to 10 years(this year) and going strong,normally if a PSU fails its within the first 3 years.

I've had two well known brands that failed within 3 years,all those that get pass 3 years seem to last for ages in my PCs,so 7 year warranty is not a big deal to be honest,oh and I also own a Corsair PSU too.
End of the day I'm sure many owners have decent PSUs more then 7 years old going strong .



850W is what I would go for ,infact I have a Corsair 850W TX V2(built by Seasonic) its not modular but excellent and very quiet PSU.