Cooler Master Real Power 1250 Review

ajmatson - 2007-10-23 07:46:53 in Power Supplies
Category: Power Supplies
Reviewed by: ajmatson   
Reviewed on: December 5, 2007
Price: $TBD



With all the newest, fastest, and baddest computer components coming out these days, you need to make sure you have enough juice to power them all. Under load, the ATI 2900XT draws approximately 300 watts for a single card setup. Go Crossfire and you are looking at about 600 Watts maximum draw. You favor nVidia cards? The 8800GTX draws about 225 watts at full load with one card and around 450 watts with two cards running in SLi (Scalable Link Interface). Now look at your current power supply and what is the maximum wattage it allows? The average user has a 600 to 800 watt power supply and that does not have much room for any other components. For today’s hardcore gaming systems you need at least a kilowatt or more. Do I have you scared and running out to buy a new PSU now? Well wait one minute and let me introduce the Cooler Master Real Power Pro 1250 watt PSU to you before you go and spend your hard earned cash.


Closer Look: 

This Cooler Master Real Power 1250 came in a huge box that was the heaviest power supply I have ever picked up. On the front is an image of the bottom of the Real Power 1250, along with the logo for the five year warranty. The back highlights the key features of the Cooler Master Real Power 1250, along with the specifications and a list of the connections available.



The sides just display the basic bar codes and name of the product.



Once you get it open you see why the box is so huge. Look at all that cabling; it takes up almost as much space as the Real Power 1250 itself. It would have been nice to have the Real Power 1250 with modular cables to keep the airflow inside the case at a maximum without having "dead cabling" laying everywhere. I do like how Cooler Master packs the box keeping the Real Power 1250 safe.


Once we get everything all out we get to see what is packed in that box. You have the Cooler Master Real Power 1250, the power cable, mounting screws, Cooler Master case badge, and a Cooler Master branded bottle opener key chain.


Now that we have everything out let's get a better look at the Real Power 1250.

Closer Look:


Here you can see the PSU in all of its glory. It is extremely shiny and has perforations in the front and the back to help with airflow. Underneath you get a glimpse of the massive 120mm fan that draws the hot air from the top of the case by the CPU and pushes it out of the back of the case. On the side it displays the voltages and information about the power supply.










This unit has a nice shine to it. This makes it aesthetically pleasing in a nice windowed case. If you put a coin up to it, you can clearly see its reflection.



Now that we see what the outside looks like, I am going to open it up so that you can get a view of what the guts of this unit look like. I strongly recommend against opening up any power supply as it will void your warranty and can cause harm or death if not done properly. This is why I am going to do this for you, so that you will not have to. Once opened you get to see the large heatsinks and capacitors that sustain this power supply, giving it the power you need. You also can get a better look at the 120mm fan that is used to cool the unit.



Closer Look:

This unit is a beast when it comes to cables, as well as power. One thing you will never have to worry about is not having enough connections to power your dream rig. This power supply supports Quad SLi configurations and has all the latest plugs for any piece of hardware currently on the market. The main connectors consist of a standard 24-pin motherboard connector, a 4-pin +12v CPU connector, and an 8-pin +12v CPU connector for newer motherboards.









For graphics cards, you have enough to support multiple cards for all your gaming needs. There are six 6-pin PCI-e connectors, as well a three 8-pin PCI-e connectors for high end cards like the ATI HD 2900 series and future cards that might hit the market one day.



Do not despair if you are a hard drive junkie like me, Cooler Master has you covered there too. The Reap Power Pro 1250W provides you with eight SATA connectors, seven 4-pin Molex connectors, and two 4-pin floppy connectors.



Now that you see what is available for use, let's get this baby installed to see how it performs.



Installation of a power supply is quite simple and only takes a couple of steps. First thing you will want to do, if you haven't already, is to remove the old power supply. To do this, first unplug it from the wall and remove all cabling from the motherboard and any components. Then remove the four screws in the back of the computer chassis going into the computer supply. Tilt the supply downward and out of the case. Since this is often so close to the CPU fan and other parts of the motherboard, I suggest you work slowly and cautiously, so that you do not cause any damage to parts already installed in your computer. If your case has a removable motherboard tray I suggest taking it out prior to changing the PSU.










Now that the old one is out, let's install the new one. Carefully slide the power supply into the PSU bay, watching that you don't damage any of the motherboard components or the CPU fan. Once into position, take the four screws included in the packaging and screw them in to secure the PSU. If you're into cable management like myself, now would be a good time to plan where you want your wires to go. Then plug in all of the cables needed and tuck away the ones not being used. This creates better airflow in the case.




Now that everything is installed and tucked away we need to connect the main power cable to the power supply. This power supply requires an outlet specified for 125V AC so make sure your house is wired for the right voltage before plugging it in and causing damage to something. Remove the warning sticker and plug in the cable. Once it has power, the LED above the plug will glow green letting you know there is power to the unit. This particular PSU does not have an on/off switch so to disconnect power you have to physically remove the plug from the unit.




Model Number:

ATX Form Factor 12V V2.3 / SSI standard EPS 12V V2.92

Dimension (W / H / D):
150 x 180 x 86 (mm)
Input Voltage:
90 ~ 264V (Auto Range)
Input Current:
16A @ 115Vac / 10A @ 230Vac

Input Frequency Range:

47 ~ 63 Hz
Active PFC (0.99)
Power Good Signal:
100 ~ 500 ms
Hold Up Time:
> 17 ms
>85% Typically
>100,000 hrs
Output Capacity:
1250 Watts Continuous
Max. Output Capacity:
1375 Watts
Operation Temperature:
0~50℃(Nominal Input Voltage)
NVIDIA SLI-ready / 80 Plus
Ultra-silent 135mm fan with intelligent speed control





Now let's see how this power supply holds up against other power supplies while idle and at load. I am going to compare the Real Power Pro 1250 with the Cooler Master Real Power Pro 750W PSU and the Sigma Shark 635W PSU to see how it holds up with the six rails versus the four rails of the Real Power Pro 750w and the two rails of the Sigma Shark 635W power supplies. Does having more rails make the difference in power and stability? Well we are about to find out.

To load the Real Power Pro 1250W PSU, I loaded it up with extra hard drives, 3 video cards, 2 optical drives, and extra fans. Then I ran Prime95, AVG Anti-Virus, a DVD movie, and looped 3DMark06 to stress the system as much as possible.


Testing Setup:
Power Supplies Tested:
Testing Equipment:


First up are the 3.3 voltages. Remember you want to be as close to the 3.3v as possible.



Now we have the 5.0 volts



And lastly for the 12 volt rails.


Even under stress, the Cooler Master Real Power Pro1250W held up quite well, never deviating from the specified voltages more than the negligible amount allowed in a power supply. Not once did I get any feeling that my hardware was underpowered while stressing it. Now I know I can add anything to my computer and no longer worry if I have enough power to push it to the max.


This power supply compared well to the others, never going too high or too low on the voltages. Having the six rails is reassuring; I never have to worry if there is going to be too much of a load on one rail, crashing my system in the middle of a game. There are so many connections provided that you would be able to build the ultimate rig with SLi or Crossfire and stuff it full of RAID-configured drives and still have room for future expansion. Since the PSU has three 8-pin graphics card power connections, a buyer would not have to worry about needing a connection for a future graphics card that does not use the standard 6-pin most PCI Express cards use today. The included fan on the PSU also keeps the power supply cool, never getting hot to the touch during load times. This also helped keep the case cooler, drawing out the hot air floating near the top of the case.

The only drawback I had with this power supply was the fact that the cables were not modular. I tested the CoolerMasater Real Power 1250 out on a mid tower case and had to free up two drive bays to hide the extra cables I was not using. This can present some unique challenges to the end user with a mid tower case stacked full of hard drives and optical drives. In real world terms, the decision to make this power supply not a modular has to be questioned. Having the ability to connect up anything and everything is great if you only had the option of not installing all the extra cabling. If power is what you are looking for, the CoolerMaster Real Power 1250 delivers. At the time of this review the pricing has not been released, but with the 1000 watt model going for $299 I would expect  the price to be above that mark.  I would recommend this to users that have full tower cases to place this in.