Rosewill Xtreme Series RS850-S-B 850 Watt Power Supply
Author: Frank Stroupe
Editor: Shawn Knight
Date: 11-07-2007
Provided by: Rosewill
Discuss: View Comments

For the five years that I have been building computers, Rosewill has been one of those companies that I really haven't considered using their products. I generally have bought the “upper-end”, proven brands that most other enthusiasts who overclock depend on. I've thought of Rosewill as a maker of low end parts, used by builders who really weren't choosy about what they put into their rigs. To be honest, I have purchased one Rosewill item, an IEEE PCI card. It wasn't the cheapest, but it was the cheapest made by a brand I had heard of. So, I guess you could say I considered Rosewill a generic brand.

That is, until recently. A few weeks ago, I reviewed my first Rosewill hardware item, the Rosewill R6AS5-BK Mid-Tower Case. Prior to reviewing the case, I really wasn't very enthused about it. Once I received the case, and started really looking at it, I was very surprised at the high quality and attention to detail that Rosewill had paid to this inexpensive case. I even found a few innovations on it that I hadn't seen on cases costing more than twice as much. So, I started doing a little research, and found that Rosewill actually has some excellent products, and seem to be beginning to market their products towards discriminating enthusiasts.

When Shawn asked if I was interested in reviewing a Rosewill power supply, I didn't even have to think about it. I fully expect this power supply to be of as high quality as the case.

The Xtreme is packaged in this fairly nondescript box It's pretty cool, actually, all that is on the exterior box is the Xtreme logo, the Rosewill logo on the ends of the box, the Rosewill URL and a UPC label on the bottom telling which model the box contains.

The PSU is well protected within, in a nest of soft layered foam. I guess it is as well protected as any PSU I have ever received. In the box, the PSU appears to be modular-configured, which surprised me, as I didn't think it was.


Model RX850-S-B
Type ATX12V v2.2 & EPS12V v2.91
Maximum Power 850W
Fans 1 x Silent 135mm Ball-bearing Blue LED Fan
FPC Active
Main Connector 20+4Pin
Dual +12V Yes
PCI-E Connectors 4 x 6Pin
SLI Support NVIDIA SLI Support
Modular Cabling Support No
Power Good Signal 100-500ms
Hold-up Time > 16ms at Full Load and nominal input voltage
Efficiency Minimum of 80% efficient under typical load, Up to 85%
Over Voltage Protection +3.3V, +5V, +12V1, +12V2, +12V3, +12V4
Input Voltage 100 - 240 V
Input Frequency Range 47 - 63 Hz
Short Circuit Protection All Output Equipped With Short Circuit Protection
Input Current 15A/ 7.5A
Output +3.3V@24A,+5V@30A,+12V1@20A,+12V2@20A,+12V3@20A,+12V4@20A,-12V@0.5A,+5VSB@3A
MTBF 100k hours at 25°C, max. load, nominal input
Approvals UL, FCC, CSA, CB, CE, TUV
Dimensions W x H x L 150 x 86 x 190 mm , 5.90" x 3.39" x 7.48" inch
Warranty 3 Years


· Supports ATX12V v2.2 & EPS12V v2.91 standards
· Supports both Intel and AMD Systems
· Four 12V rails provide independent reliable power
· Active Power Factor Correction(PFC) with PF value=0.99 provides clean and reliable power to your system
· SLI Ready - Support up to Dual GeForce 8800GTX
· 12V Combined Output 64A
· Efficiency > 80%, Up to 85%
· Silent 135mm 2 Ball-bearing Blue LED Fans with Auto Fan Speed Control
· 20+4 pin main connector for universal motherboard compatibility
· Black Chrome Mirror Finish
· Mesh sleeving on all cables for easier cable routing and better ventilation
· Built-in inrush current, over temperature/current/voltage protection circuits
· Safety & EMI Approval: UL, TUV, CE, FCC, ROHS
· Output connectors
1x 20+4 pin Main Connector
1x 4 pin ATX12V Connector
1x 8 pin EPS12V Connector
4x 6 pin PCI-Express Connector
1x PCI-E 6-pin to 8-pin Adapter
6x 4 pin Peripheral Connector
6x 5 pin SATA Connector
2x 4 pin Floppy Connector

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