New York, NY
|reply to DavisPhotog |
Re: SSD data transfer questions
I agree, some 512GB SSD drives have dropped to as low as ~$550 or so. Still not cheap but manageable. As prices drop though there may still be other things to consider (such as the controller):
I noted their 480GB* models are listed as having the same high IOPS specs, which we figure must be a misprint since *any* SandForce 2281 SSD with a capacity greater than 256GB will see a dip in 4K IOPS performance. This is due to the way the SF controller handles the mapping of LBA's. To double capacity from 240GB to 480GB, the SandForce controller's finite number of allocations must be reconfigured to utilize 8KB blocks (up from the standard 4KB - intentionally matched to the NTFS 4KB cluster size). This negatively impacts IOPS performance as a 4KB random write translates to the equivalent of an 8KB random write once the added overhead is taken into account.
If this is a truly hard limit, a 1TB SandForce 2281 SSD would have to again redouble its allocation unit to 16KB and would then be theoretically kneecapped to an again-halved ~20,000 4KB random writes.
*I confirmed the Force 3 and Force GT have specs of 50,000 and 55,000 random write IOPS on their respective listings over at Newegg.