Only one fast SSD in group of four

[joelbedfordphotography]

I have four ssd’s. One is nvme m.2 (Samsung 970 pro) running my OS on an old pcie gen 2 x 2 slot (yeah still on 1150, but upgrading to 1151 or x99 soon to actually make it useful) - the speed on that drive is predictably slow (800mbps r/w avg) but the other 3 are connected via sata 6gbps. One of the drives (Samsung 850 evo with rapid mode enabled) does about 5,5gbps read and about 5gbps write which is fine, but the other two achieve sluggish speeds of 500mbps read and 242mbps write (Samsung 840 evo) and the last one (another Samsung 850 evo) does only about the same speeds as the m.2 drive.

I ran all speed tests through Samsung’s magician software and wasn’t using the other drives during performance benchmarking.

What do I have to do to get my two sata-connected drives running as fast as the third one? The NVME is using the pci bandwidth so I understand that that drive is limited for now.

i7 4770k oc’d @ 4.4ghz
Z97-P board
32gb ram @ 1866
gtx1070
750W power

 

[popatim]

They aren't slow, you are just being fooled by Rapid mode which is actually a Ram buffer that is being benchmarked, not the SSD itself. Sata 3's Top speed is about 520MB/s no matter which drive you put on it.

 

[USAFRet]

(Samsung 850 evo with rapid mode enabled)

RAPID mode is mostly reading your RAM speed, not the drive speed.
Turn it OFF, and it will read at normal 850 EVO speed.

 

[joelbedfordphotography]

OK, thanks all - I thought I should be getting faster speeds with all my drives, but this resolves my concerns.