AMD 5700 xt very low memory frequencies

[EndrII]

Hi
I noticed one very unpleasant feature and I can’t understand what the problem may be,
The manufacturer of the video card claims that the memory frequency should be at least 3500 MHz, but in fact I get only 875 Mhz
Tell me what could be the problem ?

my OS ubuntu 20.04
device: Sapphire Pulse RX 5700XT 8G GDDR6
Driver info :

Although in windows on the same machine, the memory frequency seems to be higher than 2000 mhz.

is it a data display problem for your utility or a driver problem?

I tried to check the frequencies with drivers from the official AMD website and with free mesa drivers. In both cases, I get a very low memory frequency (under load).

[marazmista]

Values in this tables comes from sysfs files (pp_dpm_sclk and pp_dpm_mclk) so if they don't match with the specs I would think that there is something wrong with the driver.

[EndrII]

i am duplicate this issue in mesa forum . Join the discussion )

[EndrII]

People from mesa explained how to correctly count the effective frequency in this issue

We expose the actual memory controller clock rate in Linux, not the effective memory clock of the DRAMs. To translate it, it follows the following formula:

Clock conversion (Mhz):

HBM: effective_memory_clock = memory_controller_clock * 1

G5: effective_memory_clock = memory_controller_clock * 1

G6: effective_memory_clock = memory_controller_clock * 2

DRAM data rate (MT/s):

HBM: effective_memory_clock * 2 = data_rate

G5: effective_memory_clock * 4 = data_rate

G6: effective_memory_clock * 8 = data_rate

Bandwidth (MB/s):

data_rate * vram_bit_width / 8 = memory_bandwidth

Some examples:

G5 on RX460:

memory_controller_clock = 1750 Mhz

effective_memory_clock = 1750 Mhz * 1 = 1750 Mhz

data rate = 1750 * 4 = 7000 MT/s

memory_bandwidth = 7000 * 128 bits / 8 = 112000 MB/s

G6 on RX5700:

memory_controller_clock = 875 Mhz

effective_memory_clock = 875 Mhz * 2 = 1750 Mhz

data rate = 1750 * 8 = 14000 MT/s

memory_bandwidth = 14000 * 256 bits / 8 = 448000 MB/s

[some-username-here1]

Has this been patched in yet, by any chance? I don't really know a lot about coding, so I'm unable to help out

[EndrII]

@some-username-here1 this is mistake on the view components of the radeon-profile. the driver of 5700 XT work on linux correctly.