New core, possibility to bypass PCIE traffic limitation?

If you think it might be a driver problem, see viewforum.php?f=79

Moderators: Site Moderators, PandeGroup

Post Reply
ProDigit
Posts: 243
Joined: Sun Dec 09, 2018 10:23 pm

New core, possibility to bypass PCIE traffic limitation?

Post by ProDigit » Wed Jan 30, 2019 4:32 am

Is it possible to program future cores to bypass the PCIE bandwidth bottleneck on PCIE 1x slots using faster graphics cards?
If it was possible to send data more continuous, and buffer in VRAM, vs short peaks or bursts of data that are throttled by the PCIE 1x speed...

PCIE 5.0 is on the horizon, but the majority of the hardware will still have at least a few PCIE 1x slots; that seem to perform quite poorly under Windows.

Joe_H
Site Admin
Posts: 4482
Joined: Tue Apr 21, 2009 4:41 pm
Hardware configuration: iMac 2.8 i7 12 GB smp8
Mac Pro 2.8 quad 12 GB smp4
MacBook Pro 2.9 i7 8 GB smp3
Power Mac G4 dual 1.73 1.5 GB (retired)
Location: W. MA

Re: New core, possibility to bypass PCIE traffic limitation?

Post by Joe_H » Wed Jan 30, 2019 5:34 am

Probably not. The reason is that a GPU is not a general purpose processor like a CPU, for the calculations being done it is essentially being used as an attached vector processor for the data contained in the WU. Essentially a block of data is passed to the GPU with a specific set of operations to be performed on it. Each block then has to be coordinated with the adjacent blocks. After a pass through all of the data the results become the inputs for the next pass. I don;t really see an opportunity to buffer any of that data.

At no time is all of the WU data sent to the GPU, for larger WU's it might not fit on the largest cards anyways. On top of that, VRAM is holding the output from the shaders in a video format, I don't think the shaders can read from it.
Image

iMac 2.8 i7 12 GB smp8, Mac Pro 2.8 quad 12 GB smp6
MacBook Pro 2.9 i7 8 GB smp3

JimboPalmer
Posts: 857
Joined: Mon Feb 16, 2009 4:12 am
Hardware configuration: Several dozen Core2duos and i3s at a Mental Health organization. About six i5 at home, including a GTX 1050ti GPU that does half the total points.
Location: Greenwood MS USA

Re: New core, possibility to bypass PCIE traffic limitation?

Post by JimboPalmer » Wed Jan 30, 2019 9:40 am

Just to be clear, this Forum is for CPU projects, and CPU projects do not have PCIE issues.

Edit by Mod: Topic Moved to correct that issue.
Thanks for noticing.
Tsar of all the Rushers
I tried to remain childlike, all I achieved was childish.
A friend to those who want no friends

Post Reply

Return to “GPU Projects and FahCores”