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Disappointing Disk Thruput (400MB/sec)

post #1 of 9
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Motherboard: ASUS Rampage III Extreme
Controller: Onboard Marvel SATAIII 6Gb/sec Raid
Drives: Two of OCZ Vertex 3 Max
RAID: 0


Buying this computer with the combination of these unbelievably fast rated OCZ SSD's (paid ~$600 all together for 2 drives 120GB each). Drives claim to support up to 550MB/sec reading and writing.

With the RAID0 stripe I (foolishly?) expected 1100MB/sec.

Each drive connected on SATAIII 6Gb/sec (768MB/sec) should have been enough to support this... 768 > 550...

When the Raid BIOS loads however it clearly states:

Interface: PCI-E 1x (5.0Gbps)

(or 640MB/sec)...

Upon benchmarking the system with IOmeter (used correctly even)... It clocks at 400MB/sec on the stripe.

My thoughts:
640MB isn't theoritcally acheivable data rate due to some block level io overhead. the 5.0Gb/sec interface should be able to support atleast 500 to 600MB i would think.
The raid controller is CPU powered. I have the 'fastest?' CPU in this system (i7 extreme 990x and clocking 4.0Ghz without blinking.

Could the CPU having to handle the virtual disk be slowing things down some more?

Being that the raid controller, even though it's got 2 6Gb ports, the entire controller is only connected on a 5Gb bus so my 1100MB dream is shattered.

Why in the world would ASUS engineer it like that? Is that all that is available to the southbridge?

I have 4 PCIe high speed slots. They can run in 16x, 16x/16x, 16x/8x/8x, or 8x/8x/8x/8x. I have two GTX590 video cards running at 16x/16x. This is a must for the dual GPU cards to make any use of their performance. Using an addon controller card is not an option.

I did know this information about the SATA bus uplink prior to purchasing all the high end parts. In hindsight, i would have payed considerably less for slower drives that could have provided the same level of performance.

All told 400MB/sec isn't bad of course, but disappointing compared to what i was hoping for.

Your thoughts?
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post #2 of 9
your marvel raid controler can provide a maximum of 500MB/s of bandwith actually .. so you topping at 400MB/s isnt so bad ....


if i did get the exact model here are its spec




http://docs.google.com/viewer?a=v&q=...6LDQTMeYR-NlQA
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post #3 of 9
FroSty,

Is sata III still an overkill? But seeing how fast technology advances, it is just a matter of time when we can really see the benefits of sata III, am I right?
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post #4 of 9
not that its an overkill or not .. its just that this particular raid controler that asus implemented isnt powerful for the task that OP wanted or at least expected ....


his raid controler can only access 1x of pci-e 2.0 bandwith .. wich isnt that good ... a measly 4x would have been way better
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by Fr0sty View Post
your marvel raid controler can provide a maximum of 500MB/s of bandwith actually .. so you topping at 400MB/s isnt so bad ....


if i did get the exact model here are its spec




http://docs.google.com/viewer?a=v&q=...6LDQTMeYR-NlQA
yep that's correct controller... i guess i didn't research enough before buying... i took for granted that 6Gb sata meant each port at 6Gb of thruput to the southbridge...

i think these nice SSD's are wasted for this purpose. the motherboard also has a 7 port sataII controller.

I am planning to purchase 6 2.5" HDD's to make a raid 10 stripe/mirror in this system (for use as a virtual lab)...

i have 2 laptops that would definetely benefit from these SSDs as well but only have SATA2 and so again wont take advantage of the 550MB SSD rating...

I think my best bet might be to unstripe them and use them one at a time would probably get faster performance and would take advantage of the disks thru put better (just on one disk at a time)... also transfers between disks might be faster?
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post #6 of 9
http://www.newegg.com/Product/Produc...82E16816118114


the price isnt so big for a small 4 port raid controler ... and it would do the job just fine and it operates on a pci-e 2.0 x4 slot


wich should provide 4 times the bandwith of your onboard marvel solution ... and you can swap it on another board later on if you want


or you could have 1 of the two ssd's on your marvel controler ... and use the 2nd one in your laptop .... anyway nothing much more to do besides either going with the raid controler or doing with what you allready have
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by Fr0sty View Post
http://www.newegg.com/Product/Produc...82E16816118114


the price isnt so big for a small 4 port raid controler ... and it would do the job just fine and it operates on a pci-e 2.0 x4 slot


wich should provide 4 times the bandwith of your onboard marvel solution ... and you can swap it on another board later on if you want


or you could have 1 of the two ssd's on your marvel controler ... and use the 2nd one in your laptop .... anyway nothing much more to do besides either going with the raid controler or doing with what you allready have
i frosty than ks for the reply!

do you think adding the controller card would impact my video bus bandwidth? ie: take me out of 16x mode?

board specs just say
Expansion Slots 4 x PCIe 2.0 x16 (dual x16 or x16, x8, x8 or quad x8) *1
1 x PCIe x4
1 x PCI


maybe the 4x card wont interfere. cant hurt to try.
Edited by rpurinton - 7/23/11 at 10:11am
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post #8 of 9
not at all ... the pci-e bus is made to not interfere between ports ... if one port has 4x of bandwith it will have 4x of bandwith ... 8x of bandwith etc... unless they are 16x physical but turn into an 8x electrical under certain use ... but your mobo should list these things ...


and is the x4 slot pci-e 2.0??? if so this card will work ... and the price is fine so that's the reason why i listed the card as a possible option


and i dont see a problem with the x16 link just by running a x4 card .... if you are unsure shoot an e-mail to asus and ask them out by pointing out your current config or planned config
Edited by Fr0sty - 7/24/11 at 9:24am
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post #9 of 9
Quote:
Originally Posted by Fr0sty View Post
not at all ... the pci-e bus is made to not interfere between ports ... if one port has 4x of bandwith it will have 4x of bandwith ... 8x of bandwith etc... unless they are 16x physical but turn into an 8x electrical under certain use ... but your mobo should list these things ...
Some boards have a limited amount of lanes available. That's why some do 16x for single cards, but 8x/8x when in SLI or Crossfire.

I have heard of add-in cards triggering this decrease in speed. I'd contact the motherboard manufacturer.
     
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