Kingston SSD slow speed

[zapopaul]

Hello,

Here is my issue: I have a pc with a 3570K cpu and an Gigabyte Z77X-UD3H motherboard. On SATA0 I have a 120GB Kingston SSD V300, that hosts my OS(Windows 8.1) and on SATA1 I have a newly purchased 240GB Kingston SSD V300 that I want to use for some virtual machines. Both SATA0 and SATA1 are SATA3 ports on this mobo. I have the AHCI option selected in BIOS(I guess this applies to all the drives since there is no option to turn it on/off per drive). Both disks are formated with a 4096 bytes allocation unit size, and the device manager says the drivers are up to date for both.
Exact model of the drives:
120 GB drive: SV300S37A120G
240 GB drive: SV300S37A240G
So I guess they are the same apart from the size.

The 120GB drive that hosts my OS works fine, I get pretty close to the manufacturer advertised performance on it, but the 240GB SSD is slow, Add to that that the 120 GB is almost a year old, and the 240 disk is brand new.

120 GB disk performance as tested with Crystal disk mark:
R=Read, W=Write
Sequential: R: 433, W:142
512K: R: 394, W: 132
4k: R: 18, W: 65
4k qd32: R:105; W:140

240 GB disk performance as tested with Cristal disk mark:
Sequential R: 188, W:231
512K : R:179, W 229
4k: R:22, W: 67
4k qd32: R:123, W:219.2

The 240 GB drive is slightly better than a good mechanical disk(some 20% better than my Caviar Black disk) but it should be much faster, at least as fast as the 120 GB drive.

Any idea what might be causing this? If I have a shitty drive, I should be able to get a replacement or refund but I am not sure if I missed something.

Hope I didn't leave any relevenat information out and thanks in advance for your insight,

Paul

 

[Dereck47]

Switch the SATA ports of the 2 SSDs and retest.
If your benchmark results are the same then you know the problem is with your 240GB SSD. If the 120GB SSD is now getting poor benchmark results then you know your problem is with the SATA port on your motherboard.

 

[kmarkl]

As I understand, this could be a firmware issue. Those with the older v505 with the V300's have good performance while those with the newer v506 have seen slower performance. See the negative reviews at http://www.newegg.com/Product/Product.aspx?Item=N82E16820721107 for some insight (this is the 120gb model but I think they have the same issue as the 240gb).

 

[zapopaul]

Hi guys,

First of all thanks for your answer!
Second of all, I did some more tests, and it seems the disk is ok. The difference was given by the fact that I was running the Crystal disk mark tool from the 120 GB drive. If I move it to the 240 GB drive and run it again I get pretty good figures. Maybe this should have been obvious but it wasn't.

Cheers,

Paul