Question What should be the GPU RAM write and read speed? Rx 6900 xt

[AdekDziadek]

Hi guys,

yesterday I assembled my PC, for around 10 years I was using only laptops. I have an Odyssey 9 monitor (5120x1440) so for gaming I need quite powerfull machine. So that is my setup:
mb: MSI MPG X570 GAMING PRO CARBON WIFI
CPU: Ryzen 3900x
RAM: G.Skill Trident Z Neo F4-3600C14D (2x8GB set in Dual-channel)
GPU: Radeon rx 6900 xt (PowerColor)
SSD: Samsung 980 Pro 1TB on MVNe
PSU: Gigabyte 850W

In general something is not correct on the game, example CS:GO I have 200-300FPS on 5160x1440p while the image is flickering in some periods or it is not smooth. I started some tests. And I'm surprised of such slow GPU RAM read values, SYS RAM is also slow...

According to specs GPU should have 512 GB/s reference link - AMD Radeon™ RX 6900 XT Graphics | AMD
While my results show only

• write of 17 or 22 GB/s depends on the SYS RAM frequency (on standard 2133Mhz System RAM I have 17GB/s while with XMP 3600Mhz I have 22GB/s)
• read of 66 or 95 MB/s depends on the SYS RAM frequency

What the hell is that? 65-100MB/s Is that correct or I have wrong expectations?

System RAM is also not satisfying. According to specs Ryzen should support on 3200Mhz ~47GiB/s link Ryzen 9 3900X - AMD - WikiChip
GB to GiB link: Understanding the difference between GB and GiB (ukcloud.com)
And in my case it is:

• write 9GB/s or 12 GB/s (on standard 2133Mhz System RAM or with XMP 3600Mhz)
• read 14 GB/s or 18 GB/s depends on RAM frequency

2 pictures below 1st with 3600 SYS Ram, 2nd with 2133 Sys RAM, just switch the image on the edges

https://imgur.com/a/UNXsXRD

View: https://imgur.com/a/UNXsXRD

 

[AdekDziadek]

Anyone? I also checked on my laptop Legion with Intel i7, GTX 1660Ti and 2666Mhz RAM. GPU read is faster (consider laptop has PCI 3.0 not 4.0 like in the PC) and SYS RAM write is a bit faster when it is 2666Mhz (SPD) vs. 3600Mhz from PC on XMP profile.

Is it normal?

https://imgur.com/a/EQdx0ej

View: https://imgur.com/a/EQdx0ej