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SSD Interface Comparison: PCI Express vs SATA - Page 9

post #81 of 182
Quote:
Originally Posted by parsec View Post

... Show me the 4K random speeds.... drool.gif

The IOPs are insane... so the review uses ATTO but not AS SSD... doh.gif

Quote:
randomreadsm.png

"Small block random read operations have inherent limits when it comes to parallelism. In the case of all of the drives here, QD1 performance ends up around 20 - 40MB/s. The P3700 manages 36.5MB/s ..."


http://www.anandtech.com/show/8104/intel-ssd-dc-p3700-review-the-pcie-ssd-transition-begins-with-nvme/3
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post #82 of 182
Thanks for that, but I was not clear, I meant I wanted to see an AS SSD 4K random read result.

But it most likely will be more or less what they said in what you posted.

The comment about parallelism is important, and must be the limitation we see in 4K random reads. Large files must be spread across multiple NAND chips, so multiple channels of the SSD controller can retrieve the data more or less simultaneously, and we get ~500MB/s large file sequential read speeds.

A small 4K file is likely stored on one NAND chip, and retrieved via one channel of the SSD controller. The latest NAND chips are rated at 400MT/s (Mega-Transfers per second, usually eight bits in parallel, so 400MB/s) each, which you would think would translate to better 4K speeds, but there is more to it than that.

IMO, an exciting thing about the SSD in that review is the new controller has 18 channels between it and the NAND chips. Currently on SATA SSDs, the best we have is eight channels (the old Intel SATA II controller, and one other has 10).

The number of channels (eight) from the SSD controller has limited the capacity of SSDs to 512GB - 1TB max for a single controller. The Marvell SSD controller used in the M6e is actually a combination of two basic controller blocks that can be apparently scaled beyond that to four blocks for example. Hopefully we'll see controllers like that in the near future.

I also want to get the Samsung XP941 M.2 SSD into the USA market, it is available in other parts of the world, mad.gif and must have an interesting controller.
post #83 of 182
It's obvious Samsung read this review when it was posted, would love to see their explanation - straight from the horses mouth sort of speak - as to why we cannot get better 4K read speeds. Even that beast above isn't any better than what we see today. Obviously there's a limit and it's possibly what you mentioned.
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post #84 of 182
post #85 of 182
Thread Starter 
Quote:
Originally Posted by kpo6969 View Post

Say hello to G.Skill's Phoenix PCIe SSD Blade at 1800 MB/s

http://www.guru3d.com/news_story/say_hello_to_g_skills_phoenix_pcie_ssd_blade_at_1800_mbs.html


:D Sweet, but I want to see more PCIe 3.0 drives myself. :(

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post #86 of 182
Quote:
Originally Posted by error-id10t View Post

It's obvious Samsung read this review when it was posted, would love to see their explanation - straight from the horses mouth sort of speak - as to why we cannot get better 4K read speeds. Even that beast above isn't any better than what we see today. Obviously there's a limit and it's possibly what you mentioned.
Hi error
Why you think Samsung read review. Did i miss something that making you think that? I don't want to argue i am just interested because i see to many times on notebookreview forum how Samsung thread members finding solutions for some problems regarding their line of notebooks but nobody care to read them and apply them. Samsung is very closed and conceited ,they think they best company in the world when it comes to market they cover. Maybe ,but just maybe they buy that card to see whats in there ,but i highly doubt.
Samsung is big,to big to watch on competitors products, they start to look only if something is selling like cookes,something like iPhone or iPad.And then they make copy,pay law suits court settlement and they still manage to earn billions.That is working mode for which they see is working.
By the way i am from those that don't like Apple efforts to stop other to make similar products.I don't know how somebody can say they invented Round-Cornered Rectangle , even get that to be patent.Where are we without competition, nowhere or maybe in stone age.
Maybe this will help when it comes to 4k:
Four of these on X99 + 4 stick of 8gb DDR4. Man that system should cost 20000$ .But you know what,if i had that money to spend...without thinking ,every day and twice on Sunday



SanDisk displays ULLtraDIMM enabled server at Computex
o,and two of these, you know, just in case:

http://www.tweaktown.com/news/38249/sandisk-opens-up-4tb-ssd-behemoth-optimus-max-for-inspection/index.html
post #87 of 182
Sorry, I meant Plextor. I got my SSDs mixed up well and truly.

With the beast I was talking about those Intel based drives, even that has low QD 4K reads. The Samsung one looks impressive also but again is similar in relation to that. So now that I've hopefully got them right, I meant that it's obvious Plextor read this review and therefore could tell us - really - why we're not seeing the 4K read improvements.
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post #88 of 182
Quote:
Originally Posted by error-id10t View Post

Sorry, I meant Plextor. I got my SSDs mixed up well and truly.

With the beast I was talking about those Intel based drives, even that has low QD 4K reads. The Samsung one looks impressive also but again is similar in relation to that. So now that I've hopefully got them right, I meant that it's obvious Plextor read this review and therefore could tell us - really - why we're not seeing the 4K read improvements.
That I totally agree.
post #89 of 182
Quote:
Originally Posted by Tsumi View Post

Your GPU will be bumped down to 8x connection, assuming the 4x slot is connected directly to the CPU. Assuming that you're using a platform with only 16 lanes, like LGA1150 and FM2+.

These products will initially be very niche, and mostly reserved for those that are already buying enthusiast/prosumer parts (LGA2011). Down the line as it becomes more mainstream (won't happen for at least 1-2 years), Intel has the choice of either keeping their mainstream platform at 16 lanes (as far as I know, Skylake will be 16 lanes, thus Skylake's successor will be 16 lanes as well, meaning 16 lanes for mainstream Intel until at least end of 2017) to push people towards their enthusiast platform, increasing the number of lanes available from the southbridge (if they don't move to complete SoC), or increasing the number of lanes direct from the CPU.

In a PLX mainstream Intel board, the PLX chip allows 32 lanes of connectivity from 16. However, there still is only 16 lanes for communication from the CPU. Assuming you have two GPUs and a 4x PCI-E SSD, the first GPU would run at 16x, second at 8x, and 4x for the SSD. If GPU traffic to the CPU does not exceed 12x, the SSD won't be affected. If it does, and the SSD is attempting to use 4x traffic, you'll run into a bottleneck as the GPUs and SSD now have to share bandwidth.

Not necessarily true with the GPU being in 8x mode with a M.2. On the Asus RoG boards with M.2, on the Intel 8 series, it took up two SATA ports (these two ports were disabled if you had a M.2 card plugged into the mPCI-E/M.2 combo card.). In the 9 series boards, it shares bandwidth with a 4x PCI-E slot. If you have the UEFI in auto or mPCI-E mode, the 4x slot runs in 2x and both mPCI-E and M.2 slots run in 1x mode.

Page from the manual for the Asus Maximus VII Gene
post #90 of 182
Quote:
Originally Posted by Blackspots View Post

Not necessarily true with the GPU being in 8x mode with a M.2. On the Asus RoG boards with M.2, on the Intel 8 series, it took up two SATA ports (these two ports were disabled if you had a M.2 card plugged into the mPCI-E/M.2 combo card.). In the 9 series boards, it shares bandwidth with a 4x PCI-E slot. If you have the UEFI in auto or mPCI-E mode, the 4x slot runs in 2x and both mPCI-E and M.2 slots run in 1x mode.

Page from the manual for the Asus Maximus VII Gene

Could you please read beyond the first sentence?
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