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New build - psu advice

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September 13, 2011 7:00:37 AM

Hello all,
Just looking for some advice/recommendations on the power supply brand and watt requirement ill be needing on my new build. I have been looking at the http://www.scan.co.uk/products/750w-psu-antec-truepower... - is 750w too high?

Thoughts and opinions on the build also welcome.

The build im planning is as follows :

Intel core i5 2500k
Gigabyte GA-Z68XP-UD3
8GB (2x4GB) Corsair Vengeance Blue DDR3 PC3-12800(1600)
As for the graphics card i all ready have a GTX 460 so im thinking of throwing in a second to sli
all ready got hdd, disk drive etc

Any advice really appreciated.
Cheers, Paul

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September 13, 2011 7:43:12 AM

750w PSU is about right.

3 Modular PSU's:
Antec TP-750 Blue TruePower New 750W £80
http://www.scan.co.uk/products/750w-psu-antec-truepower...
XFX P1-750B-NLG9 Black Edition 750W £90
http://www.scan.co.uk/products/750w-psu-xfx-black-editi...
Corsair CP-9020003-UK Enthusiast Series TX750M £95
http://www.scan.co.uk/products/750w-psu-corsair-enthusi...
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September 13, 2011 8:48:11 AM

pavlos_11 said:
Hello all,
Just looking for some advice/recommendations on the power supply brand and watt requirement ill be needing on my new build. I have been looking at the http://www.scan.co.uk/products/750w-psu-antec-truepower... - is 750w too high?

Thoughts and opinions on the build also welcome.

The build im planning is as follows :

Intel core i5 2500k
Gigabyte GA-Z68XP-UD3
8GB (2x4GB) Corsair Vengeance Blue DDR3 PC3-12800(1600)
As for the graphics card i all ready have a GTX 460 so im thinking of throwing in a second to sli
all ready got hdd, disk drive etc

Any advice really appreciated.
Cheers, Paul


Since you are considering SLI I would recommend that you go with the Corsair HX 850 for the following reasons:

1. It frequently goes on sale for $120 -$145 on Newegg or Amazon - which is cheap
2. It will be more efficient, quiet and run cooler than a 750W PSU in an SLI configuration
3. It is modular: which means that you can use only the wire connections that you need and not have a bunch of extra cables all over the inside of your computer. This makes building your computer soooooooo much easier.
4. It is one of the highest rated PSUs on the market for both efficiency and stability. This means it will cost you less over time (uses less power) and it will run cooler and quieter.
5. It is silver rated but most of the time you will get gold rated efficiency performance. Up to 50% capacity it runs at 91-92% efficiency (which is almost platinum performance rated)
6. It has a seven year warranty and backed by Corsair, the best company in the business for customer service. Corsair by far takes better of its customers more than any other company
7. The HX 850 will power an SLI setup - the 750W PSU will struggle because it will be out of its best efficiency range
8. It is maybe the highest rated PSU by professional reviewers in the 750-850W range
8. The HX 850 has one of the best stability ratings in existence - it has virtually zero ripple. This means it won't damage your components as it powers them

I have the HX 850 in my computer for a single video card (ATI 6950) and many would criticize this as overkill but the critics are not well thought out in their criticism. Since my build never pushes the PSU past 50% capacity I essentially have a gold-rated (near platinum-rated) PSU for a cheap silver rated price.

In my build the HX 850 never goes to high fan and many times the fan does not even come on because it is so efficient. It is silent - cheaper smaller PSUs make a lot of noise and generate a lot of heat. They can literally be the loudest component in your case and can be VERY irritating.

Spend the extra $30-$50, you won't be sorry. Cheaper PSUs are exactly that, cheaper and they have problems.

Good luck
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September 13, 2011 9:09:41 AM

AdrianPerry said:
Why is everyone listing US website's when the OP listed a UK site? www.scan.CO.UK

Price's are very different over here the Corsair HX 850 sells for about £125 http://www.scan.co.uk/products/850w-psu-corsair-hx-cmps... which in $ would be ~$200


Great point but won't all PSUs be more expensive in Europe because of the heavy taxation? Here in the US, most states do not charge any tax for internet sales. As I understand it, in Europe these purchases are heavily taxed for the more socialist system they support.

I concede that I am not knowledgeable of Britain's pricing so I willing defer to those who live their and know their own market better.
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September 13, 2011 9:20:23 AM

Yup we get smashed with about 20% VAT and probably pay a load of import tax on Electronic Goods as well.

All components here are considerably more expensive than in the US, again most due to VAT being 20%.

I'm certainly not questioning the quality of the PSU, if the OP can fit it into budget, by all means, DO IT :)  however there are equally acceptable options at a more "reasonable" price.
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September 13, 2011 5:50:30 PM

Thanks for the feedback, some great recommendations. Sorry I should have probably stated where im from and the price range im looking at in the first post. Yes im english and everything is a lot more expensive over here .. the corsair hx 850 is lovely but a little more expensive than what i was looking to spend..will 750w struggle to run my build? I was looking to spend around £80-90 in which case adrians recommendations would be perfect but if 750w will struggle.......
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September 13, 2011 6:52:16 PM

pavlos_11 said:
Thanks for the feedback, some great recommendations. Sorry I should have probably stated where im from and the price range im looking at in the first post. Yes im english and everything is a lot more expensive over here .. the corsair hx 850 is lovely but a little more expensive than what i was looking to spend..will 750w struggle to run my build? I was looking to spend around £80-90 in which case adrians recommendations would be perfect but if 750w will struggle.......


I own the Corsair HX 750 (and the Corsair HX 850) and it is a great PSU. It will carry your system but you will be pushing it if you overclock and SLI. I had an I-7 920 system with an ATI 5850 and it would push the PSU to high fan sometimes - meaning that the PSU was over 50% capacity.

So the HX 850 will run cooler, quieter and more efficiently, but the HX 750 will work. If you can afford it, the HX 850 will do a better job but the HX750 is also a very good choice.

Here in America, the HX 850 frequently goes on sale for LESS than the HX 750. You might start tracking the UK computer component websites to see if you can pick up a sale. That will make it much more affordable for you.
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September 14, 2011 7:16:05 AM

Thanks for the reply, I do plan to both sli and overclock so i suppose i should scrape together a few more pennys for the hx 850w though it does look a little expensive to me....the cheapest i can find is £120 - ouch! Guess i should have budgeted a bit more for the psu!
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September 14, 2011 10:13:24 AM

pavlos_11 said:
Thanks for the reply, I do plan to both sli and overclock so i suppose i should scrape together a few more pennys for the hx 850w though it does look a little expensive to me....the cheapest i can find is £120 - ouch! Guess i should have budgeted a bit more for the psu!


One of the things to consider is that the Corsair HX 850 has a 7-year warranty and to if you spend a little more now you will be able to use this PSU for two or three builds. Also, nobody backs their products better than Corsair - they are without a doubt the best in the business at taking care of their customers. No other manufacturer even comes close.

Also, the HX 850 will run your system and not break a sweat - several professional reviews confirmed that the HX 850 will put out over 1000W and still remain stable and cool. With two 570s (or 560s) in SLI your system will run at somewhere between 25% - 60% of capacity. At this level the PSU will be somewhere around 91% - 92% efficient - which is not only gold rated level but it is near platinum level. Yet you are only paying for a silver rated PSU. Read Johnny Guru's review of the HX 850 - he is probably the most respected PSU reviewer in the entire computer world.

Look for sales - the HX 850 constantly goes on sale here in the US. About two months ago it was on sale at NewEgg for $120 USD which was a screaming deal. Hopefully in the UK there are similar sales.

Tom's Hardware just did a "how to choose a PSU" article - in their article they pretty much bluntly warned against going with cheap PSUs. They can seriously damage your expensive components and they cost you more to run. They are noisy and they even can explode (the really cheap ones only). Even many bronze level PSUs are junk.

Also, finally, there is a shift away from the common "spec your PSU 200W over maximum use," theory. IMO, a PSU should be spec'd to run from 25% - 50% capacity because ALL PSUs are more efficient, cooler and quieter in that range. Let me repeat - ALL PSUs are at their strongest at these capacities. The HX 850 is extremely efficient in this range and even beats the more expensive Corsair AX 850, which is a gold rated PSU.

Your max power usage in SLI will be somewhere around 400w-425W. This makes the HX 850 a perfect choice for your system. Your minimum usage will also be higher than my system and so your system will run more efficiently than mine.

True story: I purchased the Corsair Force 3 120GB SSD from Newegg. Right after that there were dozens of reviews on Newegg saying that this SSD was unstable and caused severe problems (BSODs) and freezing. It was past the 30 day return period and so I called up Corsair and I offered to pay the cost difference to upgrade to their much more expensive Corsair GT Force 3 ( emphasize the "GT"). The GT Force 3 is one of the three fastest 120 GB SSDs on the market right now and at the time it was about $120 more than the standard non-GT Force 3 which I had purchased. The Corsair REP said, don't worry about it just send us the Force 3 SSD that you have and we will GIVE you the GT Force 3 for NO CHARGE. They traded out a SSD with me that was worth nearly twice what I had paid for the standard Force 3 ($180 after rebates). And get this, they still paid the rebate to me on the Force 3. I was overwhelmed, what a kind and generous company - Corsair just guaranteed that I was going to make them my first choice every time if possible.

Pay for quality - you won't regret it.
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October 6, 2011 9:33:06 PM

Best answer selected by Proximon.
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