For Sale Online Corsair Professional Series HX 750 Watt ATX/EPS Modular
80 PLUS Gold (HX750)
Product Description
The Corsair HX 80PLUS Gold certified modular power supplies offer quiet performance, with a fanless mode at low power loads, and the flexibility of using only the cables needed for a clean system build with optimal airflow. Industrial-grade specs like a 50C power rating and upgraded internal components like high quality 105C capacitors back up legendary HX series quality, and provide you with peace of mind for a full 7 year warranty
List Price :
$159.99Price : $109.99
You Save : $50
* Special discount only for limited time
Product Feature
- 80 PLUS Gold Certified efficiency
- Multiple GPU ready
- Fanless operation at low power loads
- Continuous power output at 50C
- Low profile, black modular cables
- 7-Year Warranty
- Industrial grade components, like 105C high quality capacitors
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40 of 45 people found the following review helpful.
Fine performance, coil whine, odd fan profile
By D. Alexander
As part of my odyssey to replace a Corsair TX650 that started to make a high-pitched squealing sound at idle, I was sent an HX750 replacement. Power delivery is unimpeachable, but this model has some acoustic quirks.
Let's put it in context first. The five general parameters for a PC power supply are efficiency, wattage, noise, size, and cable modularity. I'm rolling power delivery in with wattage; almost any properly assembled 'name brand' PSU over $50 will delivery consistent, low-ripple current at the correct voltage.
EFFICIENCY:
Fifteen years ago, most power supplies were about 70% efficient. For a 100W load, they would draw about 140W from the wall. Not anymore. We now have five major PSU ratings: 80 Plus and 80 Plus Bronze, Silver, Gold, and Platinum. These correspond to half-load efficiencies of 80%, 85%, 88%, 90%, and 92%. Efficiencies at 1/5 and 4/5 load are about 4% less than half-load.
This is an 80-Plus Gold unit capable of 90% efficiency. Relative to a Bronze unit like a TX750, for a 24/7/365 system draw of 200W, you could expect to save about $12 a year in power costs at $0.12/kWH. Efficiency has other benefits: namely, every watt that isn't going the system is dissipated as heat. Less efficient units may require a faster, noisier fan.
WATTAGE:
Power delivery in this 750W model is top-tier. Professional reviews have been uniformly complementary; stability won't be a problem for any system at any rated load.
It's not necessarily the best choice for many systems, though. Most power supplies have two general characteristics: they're most efficient at half-load, and half-load is when their fans start to spin. If you want a silent PSU, your maximum load should be no more than 60% of rated capacity. A Core i7 quad using integrated video will idle around 40W and draw up to 150W at full load. A high-end ($400) graphics card will add 25W to the idle and 225W to the max load. Overlocking can bump the load total by 25%.
Because efficiency trails off rapidly below 20% load and most systems spend most of their time at idle, it's best not to buy capacity well in excess of your needs. Naturally, this conflicts with the silence objective, so it's a bit of a trade-off.
The HX750 is designed for a system with a quad chip and dual high-end graphics cards. Here's how the numbers play out relative to, say, a Seasonic G 450, also a Gold unit:
0.2 * 750 = 150W
0.5 * 750 = 375W
0.2 * 450 = 90W
0.5 * 450 = 225W
Quad-core PC with low-end graphics card:
idle: 55W
max: 200W
Same PC with a top-end graphics card:
idle: 65W
max: 375W
In all cases, the first PC will be better with the lower-capacity power supply. It'll run more efficiently and it'll still be silent. The other system will put you to the choice: do you care more about fan noise at full load or efficiency at idle?
To calculate your system's load, here's the ballpark for each component:
Quad CPU: 10W idle, 100W sustained
Motherboard: 15W-50W
Hard disk: 15W spinup, 2W idle, 7W sustained
SSD: 1W idle, 5W sustained
Optical: 1W idle, 10W sustained
Video card: 15W-25W idle, 70W-250W sustained
RAID card: 25W
NIC/sound/peripheral card: 10W
120mm fan: 3W
NOISE:
My HX750 has coil whine, a high-pitched electrical squealing, at idle. Coil whine occurs when copper coils resonate at an audible frequency. The resonance is natural, though ordinarily dampened or designed to occur above 20 KHz. It's harmless except to your sanity. There are three ways to solve it: (a) RMA the unit; (b) disable EIST and the C1E/C3/C6 halt state in the BIOS, at the cost of about 30W in idle power use; or (c) run something in the background like Prime95, also at significant energy cost. The latter two solutions defeat the advantages of the Gold efficiency rating, so I consider (a) the only appropriate solution.
Something else: by default, the fan on this unit (and the AX series) won't spin at all if temperature is below a certain threshold. When temperature passes that threshold, the fan audibly spins up to full speed for a minute, then winds back down. My server idles at 100W; this is just high enough to cause this cycle to repeat every half-hour or so. It's irritating and far less preferable to a fan that spins perpetually at low RPM.
SIZE & MODULARITY:
The 24-pin motherboard cable and the 8-pin CPU cable are permanently attached. Everything else is modular. In my server with 11 drives and no graphics card, I was able to use just two cables, a huge boon for reducing cable clutter.
This PSU is about an inch longer than most others; beware if you're buying it for a very small case.
IN SUM:
In a stacked system, this would be a wonderful PSU. Power delivery is exemplary and you won't have the odd acoustics for which I've docked two stars. Systems without powerful graphics cards will do better with lesser-rated models.
24 of 27 people found the following review helpful.
HX750 Reviewed, this is not the HX650...
By M. Esteban
First off this PSU is rated #1 by many websites. The reason is simple, it outperforms any other 750w out on the market and on top of that its backed by a beastly 7 year warranty. The packaging is superb, the PSU comes in a nice black velvet bag and all your cables come in a very handy smaller vinyl bag. The PSU is protected by two large pieces of foam and some air bags. Corsair really made sure the customers would drop their jaws once thy opened the box, well at least I did a few years back..
I purchased this beast because I had a 7 year old Thermaltake 850w that could not keep up with my OC'ed x6 @ 4.2Ghz + dual GTX 570's in SLi. I removed the the old unit and installed the HX750 and now it doesn't crash when I overclock. Single rail, gold rated and fully modular, what more can you ask for? I have been buying Corsair products for years and I have ZERO complaints. You get what you pay for...
Aside from this awesome PSU, why is it that I see a few reviews below mine that have nothing to do with the HX750?. Amazon needs to fix this ASAP, this listing if for the the HX750 not the HX650. Combining reviews from 2 different products on one listing is just going to cause confusion for potential future buyers. Of course this is not the first time I have seen such errors on Amazon but it should get fixed ASAP, it's not good for business. My 2 cents..
PS : Not sure why the users below me purchased the 650 when its clear that Corsair had a bad batch.. Do your research prior to placing your order, a few more bucks and you could of had a 750w monster that is basically flawless.
6 of 7 people found the following review helpful.
First Timer
By Jacob Stupalski
I bought this power supply based on ratings around the internet. i wanted to combine low cost with performance and ease of use. a friend told me to get a single rail to make my life easier. Even though i had never installed one of these before, i was able to pop in the modular cables and get my computer working rather quickly. i have heard people talk about the noise but i have a liquid cooling fan that i hear while this doesnt register.
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