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PSU help, need educated opinion on what to buy...

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Last response: in Components
September 7, 2008 8:21:23 AM

Hey all, Im new to this forum but have read many posts.
Just building a new PC and need help with choosing an adequate PSU for it.
I want it as a gaming rig but not an excessive. This is what i have already got:

Leadtek gtx 260 standard

EVGA 780i sli motherboard

320 gb seagate hdd

dvd rewritable

4 gb RAM corsair, 2x 2gb

q6600 quad at 2.4 standard but wish to overclock

4x 120mm fans

More about : psu educated opinion buy

September 7, 2008 9:51:51 AM

Blak op blob said:
Hey all, Im new to this forum but have read many posts.
Just building a new PC and need help with choosing an adequate PSU for it.
I want it as a gaming rig but not an excessive. This is what i have already got:

Leadtek gtx 260 standard

EVGA 780i sli motherboard

320 gb seagate hdd

dvd rewritable

4 gb RAM corsair, 2x 2gb

q6600 quad at 2.4 standard but wish to overclock

4x 120mm fans


You can run your rig through this calculator to check the wattage:

I wouldn't entirely trust the Power Supply Calculator GPU Wattage (it appears to list the average of the peak 2D and 3D power requirements). Refering to:
You can see the 260 GT has maximum 3D power requirement of 136 watts. It requires 2x 6-pin PCIe power connectors.

So it needs a PSU with 12V rails which supply at least 136/12=11 A.

At the budget end that would mean a Corsair 550VX or Corsair 520HX (for modular) for example. Ideally you operate a PSU at around 50% of its rated capacity. This is typically were they are the most efficient. At idle efficiency usually drops to ~80% (or less for a crap PSU) and the same at full load. That PSU will also handle a Q6600 overclock.

Here's a review of the 550VX:

The full list of tiered power supplies is on this thread:
this is based on build quality/component quality following a disassembly of a single unit.

If you are thinking of setting up SLI in the future (why else would you endure a Nvidia chipset :lol: ) then you will need to future proof yourself. You need a PSU with 4x PCIe 6-pin connectors and >750 Watts peak (ensures your PSU is around 50% loaded). Lots of good stuff in this market (Ultra X3 series, Corsair 1000HX, PC Power & Cooling range). Just make sure your case can fit the PSU!! (Ultra X3 and Corsair aren't very long so are a good choice.)


Related resources
September 7, 2008 10:16:10 AM

Thanks guys, i was also looking at the ODIN 550w powersupply and it seems to be pretty good but i just need a second opinion. Any thoughts about it?
September 7, 2008 10:31:44 AM

Blak op blob said:
Thanks guys, i was also looking at the ODIN 550w powersupply and it seems to be pretty good but i just need a second opinion. Any thoughts about it?

Its great I'm sure but looking on NewEgg you could get a Corsair 620HX for much less!!

Corsair are the best performers at the low end of the market (apart from some cheap Antec models that are Seasonic builds).

September 7, 2008 10:39:35 AM

IT does look like a great PSU, high chance of getting it now thanks mate, but i have quite a few peripherals that need power, will i be able to get like a hub for the PSU so i can connect them all to that corsair 620HX?
September 7, 2008 10:46:21 AM

thats overkill 135$ after rebate u could get something much cheaper and work just as fine. up to u if u have money to spend.
September 7, 2008 10:59:54 AM

Cool, thanks for all of the help with that guys. But will it support a CPU overclock because atm its hard to decide to keep my e8400 at standard clock or take my dads new q6600 standard clock. Which is better standard clock and also which is better to overclock with keeping the PSU in mind?
September 7, 2008 11:08:38 AM

e8400 oc more but i still prefer quad because it can oc just as well but not as much but 2 extra core is better. which psu did u decide on?
September 7, 2008 11:11:13 AM

well still speculating but the 620hx corsair looks good, do you have any better preference though? plus i really want maximum performance for gaming so quad would be the way to go?
September 7, 2008 11:23:47 AM

no the e8400 oc would be "slightly" better for gaming but newer games coming out soon will slowly start to support multi cores thats when quad will take over. e8400 can oc to 4.0ghz while the quads usually can hit 3.6ghz not much difference in gaming maybe 1-3fps difference. i see u have 4gig to tell u the the truth in my opinion to get better performance instead of buying such a expensive psu i would get a cheaper one and get more ram, even tho 4gig is plenty getting more ram would help a little more. (just my opinion)
September 7, 2008 11:32:12 AM

interesting. yeah i guess that is an option. But i still need a decent psu to run it all. About 550w you reckon? or still around the 600 mark? also the e8400 clock standard against the q6600 clock standard in games beats it doesnt it?
September 7, 2008 11:37:53 AM

yes the e8400 destroys the quad at stock speeds. 3.0ghz vs 2.4ghz to much difference. ya u need a decent psu look at my rig in the sig area im running my whole system off a 500w. ur sys would need a good 450w and for sli a good psu around 550w+ would be enough.
September 7, 2008 11:40:09 AM

yeah i noticed that, must be a beautiful system. is the antec psu reliable though? and with your cpu do you prefer the q6600 over the e8400?
September 7, 2008 11:48:43 AM

In my earler post I was merely pointing out the Corsair 620 HX was much cheaper than the Gigabyte PSU you were suggesting.

Like I said before you could easily get away with a Corsair 550 VX:
Very HQ and a steal at 78.00 USD after rebate.

IT IS THE QUALITY OF THE POWER SUPPLY THAT MATTERS NOT THE WATTAGE!! :hello:  :hello:  :hello:  :hello:  :hello: 

September 7, 2008 11:50:14 AM

thanks =]
antec is very reliable there earthwatt series is very efficient it will drop ur electric bill. some ppl will disagree with me but in my opinion i prefer quad. im not rich i cant upgrade every month so i decided to get the quad to make my system "future proof" when multi core is being used i will benefit over those ppl with a dual core. vista actually likes quad because all the background and aero effect can all be handled with the 4cores so vista feels slighty more responsive.
September 7, 2008 11:55:46 AM

nice, gosh all the psu's you guys are suggesting sound very appetising, more my build and wallet! lol. with the quad, even when its not oc does it perform well in games, eg crysis very high?
September 7, 2008 12:15:13 PM

2.4ghz just doesnt cut it with high end cards. it would run great but u wont see the full potential of ur card. i would recommend something at least 2.8ghz or higher. very high in crysis? hmm depends on resolution u play at. my system plays crysis at 1680x1050, all very high, 16aa and im avg around 30-35fps.
September 7, 2008 12:23:13 PM

nice, thats two 260's right? btw when you say 2.8 due you mean just overclock the q6600 to 2.8 or get the higher with the clock standard of 2.8?
September 7, 2008 12:29:41 PM

ya 2 gtx 260 oc at (core710/mem1230) from stock (core576/mem1000)
doesnt matter stock or oc as long its 2.8 or higher ur good. i prefer to by cheap cpus and oc them to much more expensive cpus. that way u save some green.
September 7, 2008 12:32:42 PM

lol being aussie our cash is all different colours lol. but yeah its good to oc to save some dough. you would have to keep both pretty cool to overclock, are you using fans or liquid? whats your cooling system is like?
September 7, 2008 12:44:43 PM

My 2cents- whatever you decide, get quality not budget - a cheap psu will only give you mucho headaches in the long run (speaking from experience...)
September 7, 2008 12:46:35 PM

here is the case i have.
i have 3 120mm fans. one in the front one on the side panel and one at the end of the case. ill admit my system isnt cooled to well. i have 2 weak fans and 1 strong fan that takes all the hot air out on the side panel where the graphic cards r so it works.
September 7, 2008 12:46:42 PM

Gaming is one of the most continuous high processing program
for gaming i prefer you to take 600 watts corsair or cooler master
take atleast 450 watts
September 7, 2008 12:51:41 PM

Nice case, yeah i have 4 120mm fans plus a 200mm one. should be cool enough for it all, i just dont want to burn my hardware out by oc's. Vankat btw when you say 600w is that just to ensure i have enough brunt?
September 7, 2008 12:54:50 PM

The corsair 550VX, or the 650TX will suit you, but in the case you go SLI the 650TX will not support it simply because of cables. To that end you will need to get the 750TX, or an even higher, but I would suggest Corsair. I recently got the 750TX because I was planning of SLI'ing my 8800GT sometime, and liked the extra power for the future as well.
September 7, 2008 12:58:13 PM

thats plenty to keep it cool. i agree with rtfm do get a good quality psu. i had a cheap raidmax and it died after a month. =[
Here r some good brands( Antec, Thermaltake, pc power & cooling, corsair)
my psu had 2 pcie and 2 gtx260 sli requires 4pcie but u can use 2x4pin molex adapter to 6pin pcie. they usually come with the card.
September 7, 2008 1:01:22 PM

ok so those brands but still around 500-600 watt? just for one GPU? how many for one card and also how many for 2 sli'd
September 7, 2008 1:08:21 PM

hell no they dont use that much power there thermal envelope is around 170w i believe. if it needed 500-600w the card would of melted.
simply put 1 gtx260 ( and with ur setup) good quality 450w.
2 gtx260 in sli good quality 550w+
a c 195 ) Power supply
September 7, 2008 1:11:00 PM

I see a lot of posts rehashing the relevant points. Start with the PSU calculator at Select the components you'd like to have after upgrades (e.g. the second GPU for SLI).
I would add a cushion; as was pointed out earlier, a PSU is more efficient when operating in the middle of its range. Off the top of my head, a 650W PSU would probably be a good size for you.

The quality listing at is old, but still not a bad place to start. You'll probably be safe if you choose something from a company with nothing under tier-3. Many of us like to park on tier-2 or better. PC Power & Cooling, Antec, OCZ, Enermax, and Seasonic should all be good choices.
September 7, 2008 1:11:20 PM

lol okey dokey. sounds good. ill try to get a good one. btw 64-bit would be the best way to go vista?
September 7, 2008 1:14:33 PM

yup 64bit would be best since u have 4gigs. 32bit has limitation with 4gig.
September 7, 2008 1:18:26 PM

nice thanks invisik, been a great bloke. Thanks. Thanks to everyone else that has helped, its much appreciated. If i have anymore queries i know who to contact. Thanks all catch yas later ...
September 7, 2008 1:25:11 PM

np if u have and more ?'s feel free to ask.