Which PSU?

TwoCables

· #2 · Mar 13, 2009

2

Quote:

Originally Posted by Kornowski

I'm looking to replace my PSU (in sig, for sig rig), which of these two would you say was the better?

http://www.ebuyer.com/product/134694

http://www.ebuyer.com/product/135194...oduct_reviews#

I don't really like the look of the second one, it's a no brand PSU. How's the CM PSU, I've looked up some reviews and it sounds pretty good.

It'll run my rig, right?

Thanks!

I apologize for such a question/reply, but since you already have a really good PSU, may I know why you'd like to replace it? Perhaps it'll help us increase your PSU choices!

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Enigma8750

· #3 · Mar 13, 2009

If you are going sli 750 just barely cuts it. Better go with the 1k

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Kornowski

Discussion Starter · #4 · Mar 13, 2009

4

Quote:

Originally Posted by TwoCables

I apologize for such a question/reply, but since you already have a really good PSU, may I know why you'd like to replace it? Perhaps it'll help us increase your PSU choices!

I'd just feel a little better having a bigger PSU. I'm currently using it with my rig, but I've been getting random BSOD's (will run Memtest soon!), I just want to single things out.

Quote:

Originally Posted by Enigma8750

If you are going sli 750 just barely cuts it. Better go with the 1k

Dude, I'm not powering NASA. I've been running my SLI rig with my 520watt PSU for a few months now.

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Penicilyn

· #5 · Mar 13, 2009

Quote:

Originally Posted by Enigma8750

If you are going sli 750 just barely cuts it. Better go with the 1k

You're kidding right?

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Enigma8750

· #6 · Mar 13, 2009

6600 + Mobo + Hdd + Drives = 350 watts
two Nvidia big boys 125 each 250 watts
total pull off the PSU 600 watts
1.25 tolerance 750 watts

So if you buy a 750 watt PSU you already have it working at 85 to 90 % Capacity.
That is why I say the 1K because of the room for growth. Or you next build will include a PSU again. Better to have too much than not enough.

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ACHILEE5

· #7 · Mar 13, 2009

How about this one http://www.novatech.co.uk/novatech/s...html?CSR-650TX
And use this to see how much power you need http://www.extreme.outervision.com/p...ulatorlite.jsp

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Enigma8750

· #8 · Mar 13, 2009

IF you want to run your PSU at 90 % at all times then go with the corsair. they underrate their PSUs anyway. that one is probably already good for 1.25 % over rating anyway. Good choice.

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linskingdom

· #9 · Mar 13, 2009

CM real power series is a soild psu and stands out the rest of CM psu. The GTS 512 is a 145w GPU so that CM real power 700w has plenty of power based on what you have.

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Penicilyn

· #10 · Mar 13, 2009

Quote:

Originally Posted by Enigma8750

6600 + Mobo + Hdd + Drives = 350 watts
two Nvidia big boys 125 each 250 watts
total pull off the PSU 600 watts
1.25 tolerance 750 watts

So if you buy a 750 watt PSU you already have it working at 85 to 90 % Capacity.
That is why I say the 1K because of the room for growth. Or you next build will include a PSU again. Better to have too much than not enough.

I ran SLI'd 8800GTS's, 4Gb RAM, RAID hard drives and a BE-2350 on my current power supply for almost a year.

You certainly don't need 1000 watts.

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shinji2k

· #11 · Mar 13, 2009

Having a look around, the M700 seems to be a good choice price-wise. I would certainly avoid that Hi-Power. It is much smarter to go with a quality supply than a junk one of higher capacity. For a modular unit it is better than other similarly priced 650W units like the Chieftec 650W from Sirtec and the Antec NeoPower 650W from Seasonic. I can also say the Corsair hx620 isn't worth the extra ~Â£15 more.

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Enigma8750

· #12 · Mar 13, 2009

I understand your side.. I really do. But on the other hand I have to say that PSUs are a large part of a building budget so why not buy just one that will last you a very long time instead of having to get a newer bigger better one every time you upgrade. It saves money in the long run and is more cost effienent to run a 1k. You are not putting the PSU under strain and it will last you a very very long time and through at least two other builds, saving you on the average at least 500.00. in the end.

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ACHILEE5

· #13 · Mar 13, 2009

2

Quote:

Originally Posted by Enigma8750

IF you want to run your PSU at 90 % at all times then go with the corsair. they underrate their PSUs anyway. that one is probably already good for 1.25 % over rating anyway. Good choice.

You're right, i read a review on the 750TX and all the components were over spec and they got just over 900w out of it

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shinji2k

· #14 · Mar 13, 2009

Quote:

Originally Posted by Enigma8750

6600 + Mobo + Hdd + Drives = 350 watts
two Nvidia big boys 125 each 250 watts
total pull off the PSU 600 watts
1.25 tolerance 750 watts

So if you buy a 750 watt PSU you already have it working at 85 to 90 % Capacity.
That is why I say the 1K because of the room for growth. Or you next build will include a PSU again. Better to have too much than not enough.

I'm sorry, but a Q6600 at 3.2, a mobo, 2HHDs and an optical will not be anywhere near 350. It would be no more than 250W. Add about 230-250W for the GTS sli and a quality 700W will be just fine.

And what is a 1.25 tolerance?

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Enigma8750

· #15 · Mar 13, 2009

I add the tolerance on my Builds for future upgrades and extras like lights and fans.

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Kornowski

Discussion Starter · #16 · Mar 13, 2009

Well, At the moment, with my CPU at stock and my GTS' OC'ed, I'm using 224watts. With my CPU at 3.2Ghz and my GTS' OC'ed, I'd be using 264watts, both at idle.

So, you guys think that CM PSU looks Ok?

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Enigma8750

· #17 · Mar 13, 2009

Again I say that the CM 750 will be enough.. I just think you should buy bigger because you can use it if you get phatter video and lights and fans and bling.

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linskingdom

· #18 · Mar 13, 2009

Quote:

Originally Posted by Kornowski

Well, At the moment, with my CPU at stock and my GTS' OC'ed, I'm using 224watts. With my CPU at 3.2Ghz and my GTS' OC'ed, I'd be using 264watts, both at idle.

So, you guys think that CM PSU looks Ok?

That CM 750w is fine and has some headroom.

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Kornowski

Discussion Starter · #19 · Mar 13, 2009

2

Quote:

Originally Posted by Enigma8750

Again I say that the CM 750 will be enough.. I just think you should buy bigger because you can use it if you get phatter video and lights and fans and bling.

I'd like to go bigger, but it's the issue with money and stuff, I'm a student, so I don't have any, lol.

Thanks for the help, I really appreciate it.

Quote:

Originally Posted by linskingdom

That CM 750w is fine and has some headroom.

Sweet, thanks man!

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shinji2k

· #20 · Mar 13, 2009

4

Quote:

Originally Posted by Enigma8750

I add the tolerance on my Builds for future upgrades and extras like lights and fans.

Most people call it overhead. It is also somewhat a standard rule of thumb to stay within 60-70% of your PSU's capacity during peak load, to account for small upgrades and reducing stress on the unit.

Quote:

Originally Posted by Enigma8750

IF you want to run your PSU at 90 % at all times then go with the corsair. they underrate their PSUs anyway. that one is probably already good for 1.25 % over rating anyway. Good choice.

Quote:

Originally Posted by ACHILEE5

You're right, i read a review on the 750TX and all the components were over spec and they got just over 900w out of it

And about the tx750, it is not rated for 900W, it is rated for 750W. Corsair just rates their units realistically. In a modern computer, 90+% of it's power is distributed over the 12V rail. Corsair rates their units with that in mind, 90+% of a PSUs capacity should be 12V. It's fairly standard for any PSU worth buying. Sure Corsair could stuff their max wattage rating by adding in more 3.3V/5V, but that wouldn't be very honest and people knowledgeable about this would call Corsair on it. If you push the tx750 to the limit it will do 900W: http://www.hardwaresecrets.com/article/505/8(site is down ATM), but it still could only do 66A on the 12V which is what we see in ~800W units. Realistically the tx750 is clearly a 750W unit, 800W at best. Any reputable PSU company will rate their units just like Corsair. Most Antec, BFG, Silverstone, PC Power, Zalman, Xigmatek, Tagan, Enermax, Seasonic, Seventeam, Etasis and the better Cooler Master, FSP and Thermaltake units are rated just like the Corsairs. It is what you should expect from a decent unit, it's not something special just Corsair does.

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