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The Adaptec RAID 51645 is equipped with industry-leading dual core RAID on Chip (ROC), the latest x8 PCI-Express connectivity, and 512MB of DDR2 cache to deliver over 250,000 IO per second and 1.2GB/s.
Excellent and Powerful
This review is from: Adaptec RAID 51645 2258500-R SATA/SAS 20-port (16 internal,4 external) w/512MB cache memory Controller Card, Kit
Pros: Fast performance, good software (Adaptec Storage Manager and BIOS support). Flexible in settings and features. Reliable if you keep it cool.
Cons: Really hot card, you need a fan dedicated to it.
Other Thoughts: I bought this the first week it was out (2-3 years ago). Very glad I did. I had the card fail at about 1.5 years, and Adaptec replaced with no problems. Today added 6th disk to a 5 disk RAID 5 array while in operation with no down time. Good documentation.
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