Review: PCIe Resizable BAR Performance Radeon RX 6000 and GeForce RTX 3000 series benchmarks

by Hilbert Hagedoorn on: 04/30/2021 12:52 PM | source: | 48 comment(s)

A couple of months ago AMD introduced SAM aka Smart Access memory, which really is PCI-Express Resizable BAR. An easy option that possibly can bring extra performance. With NVIDIA now being compatible as well we test and benchmark this feature on all compatible graphics cards, and will try and show you if it is worth the hassle.

Read the review here.

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Hilbert Hagedoorn
Don Vito Corleone

Posts: 44030
Joined: 2000-02-22

#5908880 Posted on: 04/30/2021 02:45 PM

now lets try it again without the biased AMD cpu...try it with 11900k

You're welcome to drop by and perform the 500 tests yourself

Kaarme
Senior Member

Posts: 2942
Joined: 2013-03-10

#5908889 Posted on: 04/30/2021 03:05 PM

Maybe there's something about the new console generation, based on the Zen architecture, that encouraged AMD to start experimenting with resizable bar on the PC side. Consoles have a unified memory for the APU, after all.

kapu
Senior Member

Posts: 5293
Joined: 2006-12-22

#5908893 Posted on: 04/30/2021 03:22 PM

You are on to something.

psychic717
Member

Posts: 32
Joined: 2013-02-01

#5908894 Posted on: 04/30/2021 03:23 PM

As expected, Watch Dogs Legion has stuttering associated with ReBar. It has been reported repeatedly since ReBar was released and it is again confirmed here.
Even though Nvidia white-listed it, it should be turned off for Watch Dogs Legion.

Hilbert Hagedoorn
Don Vito Corleone

Posts: 44030
Joined: 2000-02-22

#5908895 Posted on: 04/30/2021 03:28 PM

Watch Dogs Legion has stuttering associated with ReBar. It has been reported repeatedly since ReBar was released and it is again confirmed here.

Ah yes, that would definitely confirm what we're seeing in the frametime plots.

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