SATA3 Port Speed Limits?

[jaquith]

I've had bad/poor experiences with 91xx Marvell's SATA3 limit of ~360MB/s.

Q - Have you seen various P67 MOBO's Intel SATA3 port limit testing?

SSD's like OCZ OCZ Vertex 3 VTX3-25SAT3-120G are running into a wall and not achieving their Read 550 MB/s & Write 500 MB/s. I 'get' buying an LSI or other Controller and I 'get' theoretical vs obtainable, but I'd like to see what the Intel P67 'onboard' SATA3 limits. The fastest I've seen with onboard is ~ 370 MB/s onboard P67 e.g. http://www.myce.com/review/intel-sandy-bridge-and-p67-39441/IOMeter-test-results-5/ which isn't helpful

Thanks!

p.s. @tecmo34 - time to do some testing

 

[tecmo34]

I'll see about the testing :lol:

Okay... The one issue with your link is, it is showing the Vertex 2 and C300, not the newer Vertex 3 and C400 drives. You'll see the speeds get closure to the stated speeds of 550 MB/s.

http://www.anandtech.com/show/4256/the-ocz-vertex-3-review-120gb/6
http://www.anandtech.com/show/4256/the-ocz-vertex-3-review-120gb/6
http://www.anandtech.com/show/4253/the-crucial-m4-micron-c400-ssd-review/7

 

[jaquith]

I was already posting from direct 1 on 1 with another OP where we were hitting the Marvell SATA3 limit on the ASUS P6X58D-E -- after I helped him tweak the crap out of the Marvell.

The link above was an example of what I did NOT want need...{e.g. "isn't helpful"}

Marvell 9128 limit on X58, was one of the highest I've seen on that MOBO:
http://www.ocztechnologyforum.com/forum/showthread.php?87284-OCZ-Vertex-3-120-gig-slow-performance-issue-and-question

On that last link, I noticed the vague references:
* Intel Core i7 965 running at 3.2GHz (Turbo & EIST Disabled)
* Intel Core i7 2600K running at 3.4GHz (Turbo & EIST Disabled)—for AT SB 2011, AS SSD & ATTO

I did notice the 128KB Sequential with IOMeter of 415 MB/s -- Q of the (2) MOBOs tested which rendered that result -- and what port? It's still way short of the 550 MB/s!

A really nice Article would show various P67, X58, etc and the limits of the SATA3 Ports including Marvell, Intel, etc SATA3 --> THE WALLS OF SATA3

 

[groberts101]

the Marvell 9128 falls short because it's limited by PCI-e x1 lane speeds. The newer Marvell 9182 uses x2 lanes and is noticable faster(especially on the writes where it nearly doubled). here's my Marvell 9128 using the 240GB V3 and another friends 240GB V3 on the 9182.

mine.




his on post #61.
http://www.ocztechnologyforum.com/forum/showthread.php?85336-Vertex-3-Reviews/page5&highlight=vertex+3+review

 

[jaquith]

PCIe v2.x PCIe x1 is ~500 MB/s - sharing issue I still assume, and yep the Marvell 9182 is supposed to be x2 lanes. Though I really wish they came up with a better number, for the longest time I assumed it was a typo until I saw the chip.

Yep, the Marvell 9182 beats the crap out of the Marvell 9128 on writes!!!

I appreciate the link

Maximus IV Extreme w/Win7 SP1