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2 small vs. 1 large PSU

post #1 of 18
Thread Starter 
I already have one hx750 psu, and I am going to be needing a bit more power.

Should I grab anther 750w psu or get a 1200w?

I guess I'm just curious, at the end of the day, does it really make a difference?
post #2 of 18
How the heck do you need more than 750w? Quad 480s folding 24/7?
I'd recommend going for one larger unit myself, but you could just go pick up a TX650/or 750 to run a pair of GPUs, it makes life complicated unless it is running the whole time, and messy since almost no case has room for dual PSU.
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by allikat View Post
I'd recommend going for one larger unit myself, but you could just go pick up a TX650/or 750 to run a pair of GPUs, it makes life complicated unless it is running the whole time, and messy since almost no case has room for dual PSU.
I'm building an acrylic tech station, so I'm not worried about that, and it will be folding 24/7.

I'm already pushing my 750w to ~800w now, and I'm adding another gpu, so I figured its time for an upgrade. I could grab a 1000w, but I'd like to have a bit of extra wattage to keep the efficiency up.
post #4 of 18
I'd go with getting another 750w, if you can cable manage it, as you have that little bit of redundancy - if one fails, you can still run the system while you replace the failed one
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post #5 of 18
Quote:
Originally Posted by [Adz] View Post
I'd go with getting another 750w, if you can cable manage it, as you have that little bit of redundancy - if one fails, you can still run the system while you replace the failed one
^^/agree. If you can customize the setup yourself. Heck, save some money and go for dual PSU.

Side note: cable management? lol I do read that a lot. The problem is. I've looked inside my case for the first time in ~1.5 years. I have no reason to look inside for eye candy.
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post #6 of 18
Quote:
Originally Posted by donnybrasco View Post
^^/agree. If you can customize the setup yourself. Heck, save some money and go for dual PSU.

Side note: cable management? lol I do read that a lot. The problem is. I've looked inside my case for the first time in ~1.5 years. I have no reason to look inside for eye candy.
Cable management isn't just about the eye candy. It is partially, yes, but it serves a more important purpose too - airflow. Having cables everywhere restricts airflow which limits cooling. Also, have neat and tidy cables makes it much easier when you're changing the hardware, such as swapping out a drive.

For you, you've not had to do that for a year and a half, but a lot of people here are enthusiasts who take pride in the aesthetics of their computers and switch out hardware fairly often. OCN's tagline is "The Pursuit of Performance" - bad cable management inhibits performance.

For the OP, the airflow on a custom techbench isn't likely to be a concern. But being able to access the components quickly and easily probably will be. Aesthetics on a tech bench are arguably more important than in a case - if the cables are everywhere, at least their contained within a case. But on a tech bench, if the cables are everywhere, it's a horrible mess and, if there are kids or irresponsible adults around, a health and safety risk.

So, to conclude, while you may not believe cable management to be worth the time and effort that goes into it, many do.
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post #7 of 18
Please list your system specs and how you got your wattage numbers.
post #8 of 18
Quote:
Originally Posted by Phaedrus2129 View Post
Please list your system specs and how you got your wattage numbers.
yea that would help alot
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post #9 of 18
Thread Starter 
My kill-a-watt is telling me I'm currently using 976 watts (assuming that is true, )
So, the ~800w was an approximation using the efficiency graph for the hx750.
976 * 85 = 830. So, I approximated by saying ~800w.



And as far as system specs, I don't really like having them, this was just a general question of one or two power supplies, but I do realize that can vary depending on the setup.

But for curiosities sake:

My current setup (976w reading):
Mobo: SR-2
CPUs: 2 x E5620 (4ghz)
RAM: 6gb Mushkin
GPUs: 2 x GTS 450, 1 x 470 (all overclocked)
HDD: OCZ vertex, 2tb WD Green, 500gb F3

And then I will be swapping out the GTS 450s for GTX 480s, adding 6gb of ram, and the loop (I know the loop won't use much).

I would bet my hx750 could handle the upgrade, but I would be over taxing it, and I want to ensure my overclocks remain stable and that I don't want to kill the psu. I could use a 1000w, but I would like to use a more efficient amount of wattage out of the psu.
Edited by hoth17 - 12/19/10 at 2:25pm
post #10 of 18
Quote:
Originally Posted by hoth17 View Post
My kill-a-watt is telling me I'm currently using 976 watts.
So, the ~800w was approximation was using the efficiency graph for the hx750.


And as far as system specs, I don't really like having them, this was just a general question of one or two power supplies.

But if it helps here you are:

What it currently is (976w reading):
Mobo: SR-2
CPUs: 2 x E5620 (4ghz)
RAM: 12gb Mushkin
GPUs: 2 x GTS 450, 1 x 470 (all overclocked)
HDD: OCZ vertex, 2tb WD Green, 500gb F3

And then I will be swapping out the GTS 450s for GTX 480s and adding the loop (I know the loop isn't a lot).
NVM; I need to learn to read more...

Anyway if you have the room the extra 750 sounds like the way to go.
Edited by Live_free - 12/19/10 at 2:06pm
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