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With lower price and better specification, I don't see why you should choose NVIDIA® nForce 550 instead of NVIDIA® nForce 520 chipset! This newly NVIDIA® based motherboard - ALiveNF5-eSATA2+ featuring almost all specifications you could find on nForce 550 MB but comes with lower price…and better features…
ALiveNF5-eSATA2+
Feb 14th, 2007, Taipei
ASRock has once again put many practical features into one motherboard with affordable price! ALiveNF5-eSATA2+ is a newly released NVIDIA® nForce 520 Chipset motherboard featuring many useful functions such as AMD LIVE!™, PCIE Gigabit LAN, IEEE1394, ASRock AM2 Boost, SATAII and RAID etc., and it had officially passed Windows® Vista™ Premium Logo. In the very near future, you may just enjoy the new operating system without worries!
As a feature-abundant motherboard, ALiveNF5-eSATA2+ supports socket AM2 for AMD Athlon™ 64FX / 64X2 / 64 and Sempron processors, and is capable of running at 1000MHz (2.0GT/s). It is designed with 4 DIMM slots of Dual Channel DDRII800/667/533 with maximum capacity up to 8GB, 1 x PCI Express x 16 slot. As for audio part, it comes with 7.1 CH Windows® Vista™ Premium Level HD Audio (ALC888 Audio Codec), which is one important criteria to support Windows® Vista™ Premium. For storage function, ALiveNF5-eSATA2+ is featuring 4 SATAII 3.0 Gb/s, support RAID (RAID 0, 1, RAID 0+1, RAID 5, JBOD), NCQ, AHCI and "Hot Plug" functions, giving you full security of your valuable data. This new hot model even comes with the exclusive eSATAII function, giving you convenient switching of hard disks. The network and data transfer speed is going to impress you with PCIE Gigabit LAN 10/100/1000 Mb/s, and 2 IEEE1394 ports.
To talk about operating system, Windows® Vista™ operating system, of course, is what everyone expecting for. ALiveNF5-eSATA2+ is Windows® Vista™ Premium Logo Ready. To be qualified for Windows® Vista™ Premium Logo, there are some harsh requirements to be met, such as 7.1 CH Windows® Vista™ Premium Level HD Audio (ALC888 Audio Codec), DirectX 9.0, specific memory size etc, and ALiveNF5-eSATA2+ is fully compliant with those requirements.
Windows® Vista™ Home Premium:
All computers that meet minimal hardware requirements will see the Windows® Vista™ Basic user experience. Windows® Aero is an environment with an additional level of visual sophistication for Home Premium user experience.
Windows® Vista™ Aero provides spectacular visual effects such as glass-like interface elements that you can see through.

Performance Comparison table : NVIDIA® nForce 520 vs. NVIDIA® nForce 550
| Test Item | Config1 | Config2 |
|---|---|---|
| Motherboard | ASRock ALiveNF5-eSATA2+ | MSI K9N Neo |
| Chipset | NVIDIA® nForce 520 | NVIDIA® nForce 550 |
| CPU | AMD AM2 Athlon™ 64 3000+ | |
| RAM | Dual Channel DDRII 667, 512MB*2 | |
| ADD-on card | GF 7600 GS | |
| HDD | SATAII HDD 160G | |
| Test Item | Config1 | Config2 |
|---|---|---|
| 3DMark 05 Build120 | 5098 | 4983 |
| 3DMark 06 Build102 | 2516 | 2424 |
| Sandra 2007-CPU Dhrystone | 7324 | 6549 |
| Sandra2007-Muilt-Media Integer | 19018 | 17006 |
| Quake 3 | 389.6 | 352.4 |
| SUPER PI (1M) (Less is better) | 42.965 | 47.763 |
From above test results, it's obvious that the NVIDIA® nForce 520 outperforms NVIDIA® nForce 550 in many famous test items such as 3DMark, Sandra and Quake etc.