6Gbps SATA Performance: AMD 890GX vs. Intel X58/P55
by Anand Lal Shimpi on March 25, 2010 12:00 AM EST- Posted in
- Storage
Write Performance Isn’t Safe Either
Testing read performance is the easiest since I just fill the SSD with data once and can read off it multiple times. To achieve repeatable write performance however I have to secure erase the drive between each test. Not impossible, but annoying given that only certain motherboards allow me to drop the SATA ports into legacy mode which is necessary for the DOS based secure erase application to work. For that reason I’m only providing a small subset of my testbeds here to prove that write speed is also impacted:
Here the results are even more frustrating. Paired with a PCIe 1.0 slot, random write speed is virtually cut in half. The frustration comes from the fact that Intel’s native 3Gbps controller is faster than almost anything else here.
I say almost because we do have one exception. AMD’s 890GX delivers a staggering 180MB/s in random write performance, a full 31% faster than Intel’s X58. The random write speed makes me believe that with a bit of driver and/or BIOS work we can get random read performance up there as well.
Performance in the Real World
These differences are visible in the real world as well. I took four systems and copied a 10GB file from the C300 to itself and measured average write speed:
The real takeaway here is that sticking a 6Gbps controller behind a PCIe 1.0 slot wreaks havoc on performance.
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Shadowmaster625 - Tuesday, March 30, 2010 - link
It sounds like AMD made a conscious decision to focus on maximum random write performance, even if it required sacrificing all other key performance metrics. I hope that is the case, because it is pretty sad that their 6 gbps controller is generally outperformed by a 3 gbps controller!astewart999 - Tuesday, March 30, 2010 - link
When talking performance, why are they not mentioning RAID 0. I suspect SATA3 is not capable?astewart999 - Tuesday, March 30, 2010 - link
Ignore my ignorance, I read the article then posted. Should have read the posts and ignored the article!nexox - Monday, April 5, 2010 - link
Just get a SASII (6Gbit) PCI-E HBA (LSI makes one, probably others) - plenty of speed, they generally run on a PCI-E 8x slot, and you can run SATA drives in them just fine. Plus they tend not to cost too much more than the consumer-level SATA adaptors, which are apparently questionable performance-wise. They'd at least make a good baseline for comparison.supremelaw - Saturday, April 17, 2010 - link
RS2BL040 and RS2BL080 are now at Newegg:http://www.newegg.com/Product/Product.aspx?Item=N8...
http://www.intel.com/products/server/raid-controll...
http://www.newegg.com/Product/Product.aspx?Item=N8...
http://www.intel.com/products/server/raid-controll...
Before buying, confirm whether or not TRIM will work with SSDs in RAID modes.
http://www.pcper.com/comments.php?nid=8538
*** UPDATE ***
The unconfirmed bit has been confirmed as unconfirmed from Intel:
“Intel® RST 9.6 supports TRIM in AHCI and pass through modes for RAID. A bug has been submitted to change the string that indicates TRIM is supported on RAID volumes (0,1,5,10). Intel is continuing to investigate the ability of providing TRIM support for all RAID volumes in a future release”
Looks like we'll have to wait a little longer for TRIM through RAID, but there *are* other SSD-specific improvements in this new driver.
*** END UPDATE ***
MRFS
chrcoluk - Saturday, June 19, 2010 - link
Ok my thoughts.1 - you written of pcie v1 however failed to notice or mention that the plx chip uses pci-e 1x lanes from the p55 chipset so clearly pci-e 1.0 can supply the bandwidth if utilised properly, the plx chip transfers 4 1.0 lanes into 2 virtual 2.0 lanes for the sata6g and usb3.
2 - some p55 boards, mine noticebly have a pci 2.0 slot fed of the p55 chipset @ x4 speed. Seems reviewers have got something wrong or are they claiming asus have it wrong? Even if we assume its actually pci 1.0 x4 that is still enough bandwidth to feed a sata 6g controller. Indeed the onboard plx which you praised sacrifices this x4 pci-e slot and uses those 4 lanes to feed itself. My thoery is the U3S6 card asus sell will perform the same as the onboard plx in a x4 slot but no reviewer has tested this properly.
3 - whats the reason you did not test both gigabytes onboard and the lower asus onboard which borrow bandwidth from the primary pci-e x16 lanes, I am looking for tests of those in both turbo/levelup and normal mode.
gimespace - Tuesday, August 8, 2017 - link
Try enabling DirectGMA with maximum GPU Aperture in Amd catalyst control center. It does not only make the graphics card faster but allowed me to get up to the maximum 560mb/s read speed for my ssd!