Speed degrades after a few copy/paste.

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EXOdepart11

Commendable
Oct 14, 2016
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Hello everybody.
I'm running Windows 10 Pro and all drivers are up to date "Bios and all.

I have a Sabertooth X79,
Storage: x2 ADATA SX900 2.5" 256GB SSD SATA 3 SandForce 2281 550MB/SEC Write and 530MB/SEC Read, this is where Windows 10 is. Running in Raid 0 with 2x Western Digital Caviar Black 3TB 64MB Cache 7200RPM 3.5in SATA3 Internal Hard Drive OEM.

My concern is why after 3/4 copy/paste it comes to a CRAWL, like 22Mbs and stays there till i give it a long break.
I also have a 850 EVO in there that R/W at over 2Gbs then drops to 18Mbs. Same as my main drives.
My question is WHY do these drops so much and what's the fix.

PC: Sabertooth X79
I7 4820K 4.5Ghz XMP
G.SKILL Ripjaws F3-12800CL 10Q-32GBZL 32GB 4x8GB DDR3-1600 CL10
Strix 1080 A8G
XFX Black 850 PSU

Temps are very good.
I'm not sure what else to write

Thank you in advance.
 
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geofelt

geofelt

Titan
Oct 9, 2006
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Any ssd has a mechanism to free up nand blocks so writes can be written directly without the need for a read/rewrite cycle.
Some controllers are more effective than others.

It is water under the dam, but you would have done better with a single 500gb Samsung pro drive.

Raid-0 has been over hyped as a performance enhancer.
Sequential benchmarks do look wonderful, but the real world does not seem to deliver the indicated performance benefits for most
desktop users. The reason is, that sequential benchmarks are coded for maximum overlapped I/O rates.
It depends on reading a stripe of data simultaneously from each raid-0 member, and that is rarely what we do.
The OS does mostly small random reads and writes, so raid-0 is of little use there.
There are some apps that will benefit. They are characterized by reading large files in a sequential overlapped manner.

Here is a study using ssd devices in raid-0.
http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485.html
Spoiler... no benefit at all.
 
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EXOdepart11

Commendable
Oct 14, 2016
26
0
1,540


Thanx for replying so fast geofelt, but to my question... why does it drop to a crawl after 3/4 copy/paste shots of let say 2Gb in size. Maybe something is failing 'cause it never used to change in speed. Thanx again for your time, i'll keep digging. PS: i did go to the web site you mentioned.
 
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