Coolermaster GX 750 Power Supply

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Posted by on Monday, March 8, 2010 - 8:05am

coolermaster gx 750Coolermaster realized this and came out with the new GX series of power units. As of this writing, the series consists of three units: 550W, 650W and 750W. The power range is not extreme at all, but the most sought after sweet spot. The entire line-up features a single 12 volt rail, which aims it at individuals needing the most stable power when using dual GPU setups. The largest of the three is Nvidia SLI certified. If you are not interested in the multiple graphic setups, but want great efficiency; well the GX has it as well with the 85% mark on all three units. We will take a short look at the new power supply to see what it has to offer.

Introduction to the Coolermaster GX 750W

Coolermaster has been a leader in the development of cases and cooling products for a long time. Everywhere you surf there is a forum thread of builds featuring a current case. One of the most popular has to be the HAF 932 and the ATCS 840. The two cases are obviously aimed at the gamer and the enthusiast as well as the modder that want it all in a case. Each sports, great cooling, are  good looking and made with superb quality. A new favorite of mine is the newly released CM 690 Advance II. It is a great cases with tons of potential. I have plans for the sample that we received a few weeks ago.

Besides cases and cooling, Coolermaster is trying to make a name in the power supply business. In order to do that, you have to target the biggest audience looking for a power supply. That audience would be the average enthusiast to the gamer. This crowd will tell , over time, if a new product is worth it. These are the same people that will be able to put a load on a power unit to see if it is worth the asking price.

Coolermaster realized this and came out with the new GX series of power units. As of this writing, the series consists of three units: 550W, 650W and 750W. The power range is not extreme at all, but the most sought after sweet spot. The entire line-up features a single 12 volt rail, which aims it at individuals needing the most stable power when using dual GPU setups. The largest of the three is Nvidia SLI certified. If you are not interested in the multiple graphic setups, but want great efficiency; well the GX has it as well with the 85% mark on all three units. We will take a short look at the new power supply to see what it has to offer.

Coolermaster take on the GX 750W

The latest addition from Cooler Master is a range of 550W, 650W and 750W power supplies that specifically targets upper mid-range to high-end gaming systems, the Cooler Master GX Series. The Cooler Master GX range of power supplies feature a single powerful +12V rail that has been designed to deliver more than ample power to dual graphics card systems, no matter if you use SLI or CrossFireX.


 

Specifications

Model RS-750-ACAA-E3
 
Type Intel Form Factor ATX 12V V2.31
 
Dimension (W / H / D) 150 x 140 x 86 mm
5.9 x 5.5 x 3.4 inch
 
Input Voltage 90-264Vac (Auto Range)
 
Input Current 10A@115Vac, 6@230Vac
 
Input Frequency Range 47-63Hz
 
PFC Active PFC (>0.9)
 
Power Good Signal 100~500ms
 
Hold Up Time >17ms
 
Efficiency 85% typical
 
MTBF >100,000 hours
 
Protection OVP / UVP / OPP / OTP / SCP
 
Output Capacity 750W
 
Max. Output Capacity 900W
 
Operation Temperature 0~40°C (Nominal Input Voltage)
 
Regulatory TUV / CE / UL / FCC / BSMI / GOST / C-tick / CCC / KCC
 
Fan 120mm
 
Certifications SLI / 80 PLUS
 
Connector 20+4 Pin MB x 1
4+4 Pin CPU 12V x 1
6+2 Pin PCI x 4
SATA x 9
4 Pin Peripheral x 3
4 Pin Floppy x 1

Features

  • Compliance with the latest Intel standard ATX 12V V 2.31
  • Single +12V rail for the most demanding SLI configurations
  • High efficiency design that meets 80 Plus requirements (85% typical)
  • Ultra-silent operation with intelligent 120mm fan speed control
  • Multiple protection design (OVP / UVP / OPP / OTP / SCP)
  • High reliability (MTBF>100,000 hours)
  • Double Layer EMI Filter restrains noise and injury to end-user
  • Huge bulk capacitor for hold up time >17ms at full loading 
  • Integrating Active PFC with PWM combo controller not only make PFC higher than 0.99, but also raises efficiency
  • Efficient transformer for reducing 5Vsb power loss when the system is at turn-off and sleep modes
  • Five-year warranty

Closer look

We will begin by stating the GX series throughout all have the power standards of protections which includes: OVP , UVP, OPP, OTP and SCP. All are over and under protections to protect surge and alike. With the amount of money invested into today's system builds, all these protective levels is a must.

Visually, there isn't much to the GX that the we haven't seen in other power supplies. The unit is matte black, which is common today. What I like about it is that it is a perfect match for the new CM 690 Advance II interior.

The unit has a wide 140mm cooling fan to cool down its many mosfet, caps and resistors. One thing we did find unique on the GX is there is no separate grill to remove, if you had to explore the inside of the unit. The four screws are there to hold the fan in place, no other reason.

Like most power supplies, the GX uses a honeycomb exhaust panel to limit unwanted warm heat to escape. Another reason is the uninterrupted flow of the same air. No need to flip any voltage switches as the GX will auto-detect current and adjust accordingly.

One side of the limit unit displays the specification numbers of which of the rails. As we stated earlier this unit has a single 12v rail which consist of 60A in our 750w model. The lower 650w is only 52A. According to Coolermaster the GX 750 max power rating is 900w. Ideal for this spikes that may happen.

The opposite side has a huge blue GX 750W sticker. I am not a huge fan of the sticker maybe a stamped version would have been more suitable. Each his own I guess.

The cabling of the GX is sleeved in black, which seems to have become an industry standard. What makes the 750w model different from the others is the quad PCIe connectors. Each are of the six six pen variation with two pin additions.

Cables
20/4 Pin ATX
4 pin AUX
4/4 Pin AUX
4 Pin Molex
SATA
Floppy 
6 Pin PCIe
6/2 Pin PCIe
CM GX 750
1
0
1
3
9
1
0
4

Testing

We know that testing a power supply on a loaded system is not the very best way to do so, but you can not overlook real world testing. Other sites have methods that use thousands of dollars in equipment to provide them greater detail. We have a trusty digital multimeter. Those sites and the methods they use should be the true means of determining how good a power supply really is. However, we feel that showing you how it performs under real world conditions is also a valid measure of its performance.

Testing Hardware:
Motherboard: Gigabyte GA-EP55A-UD6
Processor: Intel Core i7 860 @ 3.8 @ 1.4v
Ram: G-Skill ECO PC12800 4GB Dual-Channel
Video Card: XFX HD 4770
HDD: Seagate 7200.11
Power: Coolermaster GX 750
Case: Sunbeamtech Open-Air Bench
Cooling: Coolermaster 212 Plus
OS: Windows 7 RC
Thermal compound: Arctic Silver 5

Results

When it came down to the tests, we saw very few problems. Actually, we saw no issues at all. At idle the GX performed superbly. With a load on the box, we saw a small fluctuation across all three rails. The fluctuation was not to be excited about. At .02v or less, it was well within specs of being classified as being a solid power supply.


Conclusion

We can see many people being the Coolermaster GX 750 based solely on name. In many cases, this is not a bad thing. With the new GX series, you are not only getting the Coolermaster quality, but much more. The unit is has many voltage load protections, which is important. You are also getting a very stable power supply, that is capable of powering a multi-GPU rig with ease, but within reason. The SLI certification will help the GX fly all the shelves at your local PC store. And no matter the power plug configuration of the cards you are guaranteed a perfect fit with the GX as it has quad 6/8 pin PCIe connection.

We test on an open air test bench, but I did get a chance to put the GX inside the CM 690 Advance II and the two together was an ideal fit. The matte black of the power supply along with the black interior of the case was awesome to look at. Besides the look I have to say that the unit is pretty quiet. Chances are you will find that other things in the case will be louder than this power supply.

We like that there is a bunch of extensions coming from the GX. Many power supplies have several 'legs' in order to give you all the connections you need or they think you need. We like the link of these extension as it a smaller nest of cables needing to be hidden after the rig is put together. Another option to the number of legs would have been to make the unit modular. Hopefully, we will see a GX model that is soon. Another thing about the extensions is they are fairly short. See I can only see someone using this unit in a case no taller than a mid tower.

We saw that the GX models went anywhere between $80 and $100 for the 650 and 750 watters respectfully. Not too bad for a couple of power supplies that are 80 Plus certified often seeing 85% efficiency. And we can't forget about the five year warranty.

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