| Product name | CORSAIR RMx Series RM850x (CP-9020180-NA) | CORSAIR RMi Series RM850i | FSP Group TWINS FSP520-20RGGBB1 |
| Popularity | 80 | 80 | 80 |
| Rating | | | |
| Shopineer score | 78 | 78 | 78 |
| Price | $144.99 |  $129.99 | $129.99 |
| Brand | CORSAIR | CORSAIR | FSP Group |
| Type | ATX12V / EPS12V | ATX12V / EPS12V | Redundant Power Supply (Replacement) |
| Maximum Power | 850W | 850W | 520W |
| Fans | 1 x Low Noise Fan | 1 x 135mm Fluid Dynamic Bearing fan | 2 |
| PFC | | Active | Active |
| Main Connector | 20+4Pin | 20+4Pin | |
| +12V Rails | Single | Single | 3 |
| PCI-Express Connector | 6 x 6+2-Pin | 6 x 6+2-Pin | |
| SATA Power Connector | 10 | 10 | |
| SLI | | SLI Ready | |
| Haswell Support | | Yes | |
| CrossFire | | CrossFire Ready | |
| Modular | Full Modular | Full Modular | Full Modular |
| Energy-Efficient | 80 PLUS GOLD Certified | 80 PLUS GOLD Certified | 80 PLUS GOLD Certified |
| Over Voltage Protection | Yes | Yes | Yes |
| Input Voltage | 100 - 240 V | 100 - 240 V | 100 - 120 V/ 200 - 240 V |
| Input Frequency Range | 47 - 63 Hz | 47 - 63 Hz | |
| Input Current | 12A - 6A | 12A - 6A | |
| Output | +3.3V@25A, +5V@25A, +12V@70.8A, -12V@0.8A, +5VSB@3A | +3.3V@25A, +5V@25A, +12V@70.8A, -12V@0.8A, +5VSB@3A | 520W |
| MTBF | | 100,000 hours | >100,000 Hours |
| Approvals | | FCC, ICES, CE, C TUV US, RCM, TUV, CB, CCC, BSMI, GOST, ROHS, WEEE, ROHS, KC, TUV-S | |
| Dimensions | 6.30 x 5.91 x 3.39 | 3.39 x 5.91 x 7.09 | 4.5 x 11 x 3.6 |
| Weight | 3.66 lbs. |  4.37 lbs. | 2.25 lbs. |
| Connectors | 1 x ATX CABLE 24-PIN (20+4)2 x EPS/ATX12V CABLE 8-PIN (4+4)6 x PCIe CABLE 8-PIN (6+2)6 x SATA CABLE (3 SATA)4 x SATA CABLE (3 SATA)8 x PERIPHERAL CABLE (4-PIN)1 x FLOPPY DRIVE ADAPTER (4-PIN) | 1 x ATX Connector2 x EPS Connector2 x Floppy Connector8 x 4-Pin Peripheral Connector6 x PCI-E Connector10 x SATA Connector | |
