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Running on Windows 8.1 x64. Raid is 0 on two Samsung Evo SSD. Both read and write cache is enabled.
Here's result from onboard raid (ASUS-P9X79-E-WS):
And here's from the dedicated raid controller Adaptec 6405E:
Can it really be true, that an onboard raid is faster than a dedicated raid controller?
MojoDK
Posted 2014-05-05T10:07:03.457
Reputation: 229
2
The 6405E is not fast enough for SSDs. Almost all SSDs have IOP capability that will outrun a 6405E. It's a case of balance - buying fast drives means buying a fast RAID controller. Look at the 71605E for SSD RAID 0,1,10 functionality. N
Neil Cameron
Posted 2014-05-05T10:07:03.457
Reputation: 61
1
I returned the card.
RAID on the motherboard seems way faster.
MojoDK
Posted 2014-05-05T10:07:03.457
Reputation: 229
Glad you've resolved this issue. Please be sure to mark your answer as accepted when you're able. – jscott – 2014-05-06T13:04:06.647
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RAID 0 is a waste either way. Your SSDs are perfectly capable of providing this speed standalone.
That being said, the Adaptec 6405E controller is connected with a single PCIe Gen2 lane, this results in a theoretical maximum transfer speed of 500 MB/s. This hints at the fact that it is, considering its 4 ports, meant for regular hard disks.
I’d also recommend using a benchmark tool specialized for SSDs.
Daniel B
Posted 2014-05-05T10:07:03.457
Reputation: 40 502
1You probably don't want your caches enabled. – ewwhite – 2014-05-05T10:35:01.563
Have you updated the Adaptec-Firmware and Driver to the latest versions? If not, do it. We had very big problems with old firmware revisions on Adaptec controllers. – None – 2014-05-05T18:13:47.503
Hi Lando - yes firmware is latest. This is rather strange. – MojoDK – 2014-05-05T20:29:30.223