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Mediocre SSD 4K Random Write IOPS

post #1 of 5
Thread Starter 
Hey all,


I just set up my new rig a few days ago. I have two Corsair Force GT (120GB) in RAID 0. Motherboard is ASUS RIVE.

I tested the SSD's with AS SSD and found some pretty mediocre 4K Random Write IOPS.

501

The manufacturer claims:

Random Write 4k (max): 85k IOPS (4k aligned)

6,470 is no where near 85,000

The two drives are at just under 40% space utilization and are used for C: and a currently unused partition (~12GB) soon to be linux.

My question:

Is my RAID array set up incorrectly?

Is the published speed wishful thinking?

This is my first SSD and first RAID0 so any help would be greatly appreciated!
post #2 of 5
Thread Starter 
* AS SSD is the most current version. Just tried to update and it found no new updates.
post #3 of 5
524

this is my vertex 3ogb ssd that i put a vetex turbo fw.
post #4 of 5
Thread Starter 
Obviously I have made a mistake.

The 4K random WRITES is NOT 6470, but rather 26431 IOPS.

But still, 85k >> 26k.

Perhaps what Corsair advertises as "Random Write 4k (max)" is really what AS SSD terms "4K-64Thrd"?

Judging from this thread:
http://www.overclock.net/t/1173805/understanding-4k-and-4k-64thrd

It seems "4K-64thrd" refers to 64 simultaneous requests of 4k data.

Just comparing those two categories it is interesting that:

4K Read to 4K-64thrd Read scales by about a factor of 10

Whereas

4K Write to 4K-64thrd Write scales by only about 2.75

Unless someone has further insight into this I will just take it for what it is. I am enjoying the speed even if it is gimped at the moment.
post #5 of 5
Yea, your drive is not gimped, look at the 4K-64thrd results, that is your IOPs specs come from, and they used a different program to find the spec for it too, so using AS SSD will not give you the specs from the manufacturer.
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