Evo 840's RAID 0 performing at single drive speeds?

Ironfrunk

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Hi everyone,

I have a pair of 120GB 840 Evo's running in RAID 0 and I'm showing really low benchmark speeds. The array is benching at around 560MB/s, while everywhere else I look online people are getting much more performance from their arrays.

Running on an Asrock Z87e-ITX with an i5-4670k, using the Intel SATA controller on Windows 7 x64. BIOS is set to RAID mode, OS recognizes it as an array and all that jazz.

Anyone else experiencing extremely low RAID performance with these drives? Any ideas?
 

Ironfrunk

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I've seen similar Evo RAID 0 setups around this forum achieving 900MB/s+ in ATTO or CrystalDiskMark. My setup is only benching at around 490MB/s, and the drives are individually rated at 540MBs read/520MBs write. In other words, the RAID doesn't seem to yield any performance increases what-so-ever.

Thank you for the quick response.
 

Ironfrunk

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According to both my manual and the BIOS, all of the SATA ports are both SATA3 and controller by the Intel Controller. No Marvell controller, AFAIK. The exception is that the SATA3_5 port is shared with the eSATA port on the rear I/O. Though neither of the drives are on that fifth port. They're connected to the SATA3_0 and SATA3_1 ports.
 

Ironfrunk

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Disabling c3: Same performance.
Disabling both c3/c6: lower performance.

EDIT:
Disabled all c1e; no luck either.
 

Ironfrunk

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Could my installation process been flawed?
Since this build doesn't have a disc drive I had no way to load the RAID driver in the UEFI until post OS installation. The BIOS did, however, let me configure the RAID volume (and recognized it as an Intel RAID), just didn't allow driver installtion. Could that have any affect on the way the OS handles the array?