Discussion:
O/T: HDD to NVMe completed with no problems.
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Paul in Houston TX
2018-07-26 00:28:25 UTC
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Summary:
Installed PRO 970 512GB NVMe 4x on MB, installed driver & turned on NVMe
in bios, cloned W7 hdd to NV, adjusted NV partition size, changed boot order,
rebooted. That pretty well sums it up.
No glitches or problems at all.

Crystal Disk 6: NVMe 4x 512 vs. WD500 7200 rpm, 6GB/s, SATA3, Black:
Sequential read MB/s 3288.8 vs. 164.3.
Sequential write MB/s 2328.3 vs. 163.0.

It's nice to click on something and it pops up instantly.
Games run smoother, too.
Next... hmm... 10 or 12 cpu cores would be nice.
Paul
2018-07-26 03:47:15 UTC
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Post by Paul in Houston TX
Installed PRO 970 512GB NVMe 4x on MB, installed driver & turned on NVMe
in bios, cloned W7 hdd to NV, adjusted NV partition size, changed boot order,
rebooted. That pretty well sums it up.
No glitches or problems at all.
Sequential read MB/s 3288.8 vs. 164.3.
Sequential write MB/s 2328.3 vs. 163.0.
It's nice to click on something and it pops up instantly.
Games run smoother, too.
Next... hmm... 10 or 12 cpu cores would be nice.
Your write number is realistic.

Your read number is hitting the calculated limit.

Still, your write is excellent and should keep you
quite happy.

*******

http://www.plxtech.com/files/pdf/technical/expresslane/Choosing_PCIe_Packet_Payload_Size.pdf

"Intel desktop chipsets support at most a 64-byte maximum payload
while Intel server chipsets support at most a 128-byte maximum
payload. The primary reason for this is to match the cache line
size for snooping on the front side bus."

The original link is no longer available, after Broadcom
bought them out. This will have to substitute for a download source.

https://www.mindshare.com/files/resources/PLX_Choosing_PCIe_Packet_Payload_Size.pdf

A 64-byte chipset buffer would be 0.7 * (4*985MB/sec) = 2758MB/sec read
A 128-byte chipset buffer would be 0.83 * (4*985MB/sec) = 3270MB/sec read

And I don't know if the buffer size is documented anywhere
either. Not likely to be in the "spec sheet", such as it is.

My guess is, you have a pretty good system there. Probably
a QPI based system. If it was a dinky system, you'd also be
hitting the roof on the DMI bus.

Paul
Paul in Houston TX
2018-07-26 05:26:56 UTC
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Post by Paul
Post by Paul in Houston TX
Installed PRO 970 512GB NVMe 4x on MB, installed driver & turned on NVMe
in bios, cloned W7 hdd to NV, adjusted NV partition size, changed boot order,
rebooted. That pretty well sums it up.
No glitches or problems at all.
Sequential read MB/s 3288.8 vs. 164.3.
Sequential write MB/s 2328.3 vs. 163.0.
It's nice to click on something and it pops up instantly.
Games run smoother, too.
Next... hmm... 10 or 12 cpu cores would be nice.
Your write number is realistic.
Your read number is hitting the calculated limit.
Still, your write is excellent and should keep you
quite happy.
*******
http://www.plxtech.com/files/pdf/technical/expresslane/Choosing_PCIe_Packet_Payload_Size.pdf
"Intel desktop chipsets support at most a 64-byte maximum payload
while Intel server chipsets support at most a 128-byte maximum
payload. The primary reason for this is to match the cache line
size for snooping on the front side bus."
The original link is no longer available, after Broadcom
bought them out. This will have to substitute for a download source.
https://www.mindshare.com/files/resources/PLX_Choosing_PCIe_Packet_Payload_Size.pdf
A 64-byte chipset buffer would be 0.7 * (4*985MB/sec) = 2758MB/sec read
A 128-byte chipset buffer would be 0.83 * (4*985MB/sec) = 3270MB/sec read
And I don't know if the buffer size is documented anywhere
either. Not likely to be in the "spec sheet", such as it is.
My guess is, you have a pretty good system there. Probably
a QPI based system. If it was a dinky system, you'd also be
hitting the roof on the DMI bus.
Paul
Thanks Paul.
Always an interesting reply with items for further research.
Mr. Man-wai Chang
2018-07-26 08:47:44 UTC
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Post by Paul in Houston TX
Installed PRO 970 512GB NVMe 4x on MB, installed driver & turned on NVMe
in bios, cloned W7 hdd to NV, adjusted NV partition size, changed boot
order ....
I rather take the chance to do a clean install! Might bring extra
advantages doing so.
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