GTX1070 on PCIe 2.0 slot

[Dogatron]

Hey folks,

 

I'm on a Z87 MoBo with an 1150 Intel 4770K.  I'm not trying to run Crysis at 4K 300FPS.  60-120 is good enough for me; I mostly play older games because I'm cheap.  Don't ask about my hours on Skyrim, or the number of mods.

 

My M.2 seems doesn't seem to be living up to its potential when it is using a shared PCIe 3.0 slot; I'm not trying to reach the theoretical read/write limit, but I think the fact that this NVME M.2 drive and the Asus GTX 1070 are running on a shared PCIe 3.0 lane is crippling the performance of the NVME drive.

 

The question:  Will plugging the GTX 1070 on a PCIe 2.0 slot degrade performance or cause bottlenecks?

 

I've researched this but the only answers I find are 7-8 years old.  Thanks for your attention.

 

-Dogatron

 

PS: 24GB RAM (DDR something, 1600, I think)

[Jurrunio]

M.2 on LGA1150 boards only get 10Gbps or 1.25GB/s max bandwidth in theory, also it's connected to the chipset no matter what (still the case with their current newest Z490). Don't bother trying the PCIe 2.0 slot since that means putting the GPU to the chipset.

[Dogatron]

5 minutes ago, BlueScope819 said:

Whats the spec of your NVME SSD. The PCIe slot limitations won't cause problems. Make sure the drive isn't full to the brim.

Damn, that was fast.  Thanks!

 

Samsung Evo970 1TB 3D VNAND Flash.  Just looked at the specs and it says PCIe Gen 3 x 4.  So this mf doesn't even run at x16?  Keep getting disappointing or below the curve results on benchmarks. 

 

Thanks again for your attention.

-Dogatron

[DakotaWebber]

the 4770k has an iGPU, if you really wanted to test a difference you can take out the gpu and test the drive

[Dogatron]

1 minute ago, Jurrunio said:

M.2 on LGA1150 boards only get 10Gbps or 1.25GB/s max bandwidth in theory, also it's connected to the chipset no matter what (still the case with their current newest Z490). Don't bother trying the PCIe 2.0 slot since that means putting the GPU to the chipset.

So you're suggesting put the GPU to the 4770 and the M.2 to the chipset?

 

You guys are ridiculously quick and helpful.   Thanks!

 

-Dogatron

 

[Jurrunio]

1 minute ago, Dogatron said:

So you're suggesting put the GPU to the 4770 and the M.2 to the chipset?

 

You guys are ridiculously quick and helpful.   Thanks!

 

-Dogatron

 

yes

[Dogatron]

1 minute ago, DakotaWebber said:

the 4770k has an iGPU, if you really wanted to test a difference you can take out the gpu and test the drive

Das ist eine gute Idee!  Think I'll try that, since i still have a pile of PC guts in the living room.   

 

Thanks!

 

-Dog

[Helpful Tech Witch]

How many hours have you played skyrim? How many mods have you installed?

[Dogatron]

6 minutes ago, Jurrunio said:

yes

Maybe I should have clarified: the Asus Z87-Pro does not have an M.2 slot.  I'm using a PCIe adapter.  The 2 PCIe 3.0 slots go to the CPU while the PCIe 2.0 slot goes to the chipset.  This is also a shared lane, but I don't care about this since I'm not intending to use other high-bandwidth PCIe peripherals.

[Dogatron]

3 minutes ago, TheTechWizardThatNeedsHelp said:

How many hours have you played skyrim? How many mods have you installed?

Bro, don't put me on blast like that.   I'll tell you this:

• Started Skyrim on PS3, put about cough cough some hundred cough cough and then got tired of load screens
• Skyrim on PC and dipped my toes in mods
• SSE and SKSE and Nexus Mods - the beginning of the end
  • Discovered that an exclusive M.2 NVME JUST FOR SKYRIM don't do jack for load times
  • About 200 mods
  • 2K and 4K textures always
  • Always try no to end up as a stealth archer
  • Lydia and/or Jenassa, always

We good?

 

-Dog

 

[Dogatron]

9 minutes ago, BlueScope819 said:

Yeah because PCIe 3.0 4x can do like 4 gigabytes a second no need for it to be 16x. What numbers are you getting on your drive with crystaldiskmark?

Lemme get back to you on that because I may not be using the most reputable benchmark.  I'll run Crystal tomorrow.

 

You guys are super helpful.  That sandal and sock wearing foo wasn't kidding.

 

-Dog

[Dogatron]

4 minutes ago, BlueScope819 said:

Tagging @LinusTech so he appreciates the compliment

Uh, Thanks?  In my defense, I am strongly considering GlassWire. 

 

You guys rock t*ts. 

 

Stay cool and safe!

 

-Dog!

[Dabombinable]

Since it has the same 16x slot configuration as my Z97 Sabertooth, just run the graphics card in the top slot, m.2 in the second. BTW - the platform as a whole is the main limiting factor.

[Dogatron]

1 minute ago, Dabombinable said:

Since it has the same 16x slot configuration as my Z97 Sabertooth, just run the graphics card in the top slot, m.2 in the second. Not sure if the m.2 SSD will work though without a custom BIOS. Intel reserved support for it on Z97/H97 and up.

Oh, the M.2 works as plain storage regardless.  Getting it to work as a W10 boot drive was a Bear that I fought for 5 days; you are correct, it requires a custom BIOS.  All good now booting W10 off an M.2 on an old Z87.  Now that you mention it, wondering if the non-native NVME support is what is causing the M.2 to run slower than spec.

 

Very cool.

-Dog

[Dabombinable]

49 minutes ago, Dogatron said:

Oh, the M.2 works as plain storage regardless.  Getting it to work as a W10 boot drive was a Bear that I fought for 5 days; you are correct, it requires a custom BIOS.  All good now booting W10 off an M.2 on an old Z87.  Now that you mention it, wondering if the non-native NVME support is what is causing the M.2 to run slower than spec.

 

Very cool.

-Dog

It's probably a combination of both having to use a custom BIOS, and LGA1150 being right at the start of m.2 support. I do know that there are several late H97 and Z97 boards with m.2 slots - but they are all very limited compared to newer platforms.

BTW, some m.2 NVME SSD seem to have wierd quirks when running on an adapter. My Crucial P1 doesn't run on the adapter (not even recognised), but does on the mobo, while the SX8200 Pro works fine on both.

[Mick Naughty]

Should be fine. Run mine at 2.0 16x or 3.0 8x. Cpu is the real factor there effecting gpu performance overall.

[JoostinOnline]

5 hours ago, Jurrunio said:

Don't bother trying the PCIe 2.0 slot since that means putting the GPU to the chipset.

Does that just add latency? I mean theoretically a 2.0 16x slot should be fine for bandwidth.

[Jurrunio]

6 hours ago, JoostinOnline said:

Does that just add latency? I mean theoretically a 2.0 16x slot should be fine for bandwidth.

If the lanes are from the CPU, it wont. Problem is the board only has PCIe 2 if you use the chipset lanes, which is x4.in bancwidth (unless you manually drop PCIe 3 to 2 in the BIOS)

[Dogatron]

22 hours ago, BlueScope819 said:

Yeah because PCIe 3.0 4x can do like 4 gigabytes a second no need for it to be 16x. What numbers are you getting on your drive with crystaldiskmark?

Thanks for the CDM Bench suggestion!  The perf numbers for the M.2 when it is sharing PCIe3 with the GPU are almost identical as when the M.2 drive is hogging the PCIe3 lane by itself.  This appears to me like the GPU isn't killing the perf of the M.2 when the 3.0 lane is shared.  Whether the inverse is true remains to be seen.

 

On the other hand, connecting the M.2 to the 2.0 chipset lane of the PCIe 2.0,- oof! - M.2 perf drops down to SATA3 numbers. 

 

Thanks again, guys for your insight and suggestions!

 

-Dog

[Dabombinable]

7 hours ago, Dogatron said:

Thanks for the CDM Bench suggestion!  The perf numbers for the M.2 when it is sharing PCIe3 with the GPU are almost identical as when the M.2 drive is hogging the PCIe3 lane by itself.  This appears to me like the GPU isn't killing the perf of the M.2 when the 3.0 lane is shared.  Whether the inverse is true remains to be seen.

 

On the other hand, connecting the M.2 to the 2.0 chipset lane of the PCIe 2.0,- oof! - M.2 perf drops down to SATA3 numbers. 

 

Thanks again, guys for your insight and suggestions!

 

-Dog

Pretty much the only time you won't see a PCIe 3.0 NVME SSD slowed down drastically when run via PCIe over the PCH, is when it's Ryzen 3000 with X570 or what ever Intel comes out with that has PCIe 4.0. That link between the CPU is 8GB/sec for everything on Ryzen 3000/X570 and only 4GB/sec on Intel's current boards+anything under X570.

Z87, Z97 and H97 have only 2GB/sec between the PCH and CPU.