Laptop dGPU memory speed

[hypixus]

Hello, first post here despite watching channel for years.

 

Today I was discussing with my friend the memory speeds and why he should get faster ram for their igpus (he bought prebuild with 2200G, so needed to explain why 2400MHz isnt the best choice)

Wanted to compare mine from dGPU which is onboard RX 550X with 2GB 1500MHz GDDR5.

 

I ran the calculations and results seemed... odd to say the least.

GDDR5 1500MHZ should give 96gbps speeds, but AMD driver reports half that (screenshot below)

Not to mention that it uses barely pcie 3.0 x 4 link that - in theory - means 32Gbps??? Should I look into this?

 

Specifications:

Lenovo E590 i5 8265U / 2x8gb ddr4-2400 / RX 550X 2GB 1176 MHz

 

[sof006]

What does GPU-Z say?

 

Also

https://www.techpowerup.com/gpu-specs/radeon-rx-550x-mobile.c3205

See here

 

You have the 2GB variant judging from what AMD is suggesting which is limited to a maximum of 48GB/s

 

96GB/s would be the 4GB variant

[hypixus]

1 hour ago, sof006 said:

What does GPU-Z say?

 

Also

https://www.techpowerup.com/gpu-specs/radeon-rx-550x-mobile.c3205

See here

 

You have the 2GB variant judging from what AMD is suggesting which is limited to a maximum of 48GB/s

 

96GB/s would be the 4GB variant

That sounds more logical with the limitation then. GPU-Z reports pcie x8 @ x4? What can THAT mean? Also the limitation of 48 GB/s - is that artificial or actual effect of less VRAM chips? I know that the clock is not modifiable on Windows since no matter what I do, MSI Afterburner just wont let me change frequencies of core nor ram, but worked flawlessly on Arch even from terminal with no issues.