Specifications compared


Comparing the specifications of both products reveals their design differences; the Silverstone is a single rail 12V unit, while the FSP adheres to the Intel specifications and split the 12V into different rails. Each design has its advantages, our practical tests will show if they translate into a real life difference.


In the table below we compare the different voltage rails and their maximum output as well as the extra security features:

	Silverstone DA750	FSP Epsilon 900
Input voltage	110 ~ 240 Vac	110 ~ 240 Vac
Input frequency	50 - 60 Hz	50 - 60 Hz
PFC	Active	Active
Maximum DC output	750W	900W
Over-Current Protection	Yes	Yes
Over-Voltage Protection	Yes	Yes
Short Circuit Protection	Yes	Yes
Maximum +3,3V current	28A	30A
Maximum +5V current	30A	30A
Maximum +12V current	60A	4 x 20A (max 70A)
Combined +3V, +5V output	180W	175W
Combined +12V output	720W	700W

At first sight one would think that FSP's Epsilon has a lot more power headroom than the Silverstone's PSU, there is a 150W difference in rating, though once you start looking more closely at the specifications you'll notice that both PSU's are in fact very on par.

Silverstone DA750 combined power offered at the 3,3V and 5V levels even surpasses that of the FSP Epsilon, the same goes for the its +12V, quite impressive for a single 12V rail PSU.

We can find the same kind of protection circuit's inside and both PSU's also come with active PFC. Strictly on paper; it’s already a hard decision between the two. Let’s look at the connectors:

	Silverstone DA750	FSP Epsilon 900
20 + 4 pins ATX connector	1	1
8 pins EPS12V connector	1	2 x 4 pins
4 pins ATX12V connector	1	1
8 pins PCIe 2.0 connector	1	0
6 pins PCIe connector	2 x 2 connectors	2 x 2 connectors
SATA connector	6	8
4 pins molex connector	6	6
4 pins floppy connector	1	1
Color	Black	Blue
Cooling	120 mm fan	120 mm fan
Dimensions (LxWxH)	150*180*86 (mm)	140*150*86(mm)

Both PSU's have a high availability of different connectors, this is important for high-end PSU's as users probable do not want to run CrossFire/SLI alone with one single hard disk drive, instead it could be quite possible to find 4 HDD's or more together with a couple of optic devices inside their housings. Silverstone’s DA750 can supply up to 6 SATA devices where FSP's Epsilon can even provide power for another 2 devices more. On the other hand we couldn't find any 8-pin PCIe connector on the Epsilon, but for now the 6-pin PCIe do just fine, even in CrossFire.



Silverstone and FSP have thought about compatibility with large computer housing, the shortest cable connector is still more then 50 cm away from the PSU itself. The molex and SATA connectors reach even further and will cause no problems in even the largest pc housing where the PSU might be sitting at the bottom and a SATA DVD drive near the very top of the case.

Stress testing will give us the best idea of what those PSU are capable of ->