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Slow Raid 0 On Crosshair IV Formula?

post #1 of 4
Thread Starter 
Recently I bought a Revodrive (pci harddrive) that rates at ~500MB/s for both read and write speeds, using its internal Raid 0. Anyways, after I did a fresh OS install I ran some benchmarks. In Crystal Disk Mark, my scores were pretty low, getting ~300MB/s seq read and ~200MB/s seq write. However if I ran ATTO, I would get the rated ~500MB/s. Didn't think too much of it, until I ran a program I use that patches 8GB .iso files. My max read speed was 280MB/s...my old 2 64GB WD SSD Raid 0 setup used to get 400+MB/s in this program, consistently (however this was with a Gigabyte 890FXA board).

I figured it was just the Revodrive, so I bought 2 Patriot Inferno SSDs to replace it. Just did a fresh install, and ran CDM. Almost IDENTICAL speeds for all 8 tests as for the Revodrive. But, I ran ATTO, and I was getting ~490 reads/writes. Ran my program, and I didn't see anything over 300MB/s.

Are the Sandforce controllers supposed to make the SSDs perform this way? Or is there some kind of weird compatibility issue/problem with my Crosshair IV?

any help would be great, and +rep!
Edited by syn_sic - 2/15/11 at 3:43am
post #2 of 4
It's the benchmark. The rated performance is based on a high queue depth of 32 or more.

Your file transfers are a queue depth of 1-2.
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by DuckieHo;12392606 
It's the benchmark. The rated performance is based on a high queue depth of 32 or more.

Your file transfers are a queue depth of 1-2.

then why would 2 64GB SSDs on a Gigabyte 890 perform at 120MB/s+ more than 2 60GB SSDs (which are rated even faster) on a Crosshair IV?

It's not just the benchmark...I see the difference in program usage as well.
post #4 of 4
The Sandforce SSD's do not perform up to specs with incompressible data. The Sandforce SSD's will throttle write speeds if too much incompressible data is written to them too quickly. I think they call it duraclass or something, some have complained it is a marketing ploy to label a problem with the drive as a "feature" that protects longevity.

If your work demands a lot of incompressible reads then I would recommend an Intel SSD. The Intel drives get good transfer rates with compressible or incompressible data.

As far as the SSD's underperforming on your motherboard can't really speculate without more information.
    
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