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Author Topic: AMD 7900XT low gpu usage on Align Photos and Build point cloud  (Read 9225 times)

olihar

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #15 on: October 25, 2024, 10:14:52 PM »
CPU limited (is a six years old cpu), Threadripper has plenty of pcie lanes (64).

The last slot you are running is at 4 Gbps speed. So pretty bottle necked.

Bzuco

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #16 on: October 27, 2024, 09:07:32 PM »
The last slot you are running is at 4 Gbps speed. So pretty bottle necked.
Metashape doesn't need to transfer 4GB every second between RAM and VRAM , so it is still OK.

tutoss

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #17 on: October 28, 2024, 01:04:14 AM »
CPU limited (is a six years old cpu), Threadripper has plenty of pcie lanes (64).

The last slot you are running is at 4 Gbps speed. So pretty bottle necked.

That slot was for my sound card before.
I said in a previous post that my cards were in two slots at 16x (16gb/s) and one at 8x (8gb/s).

olihar

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #18 on: October 28, 2024, 04:32:16 PM »
The last slot you are running is at 4 Gbps speed. So pretty bottle necked.
Metashape doesn't need to transfer 4GB every second between RAM and VRAM , so it is still OK.

4Gbit is not 4Gbytes, its 0.5 so it is extremely slow and unusable for any work. As the motherboard limits the slot to PCI 2.0
« Last Edit: October 28, 2024, 04:34:05 PM by olihar »

olihar

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #19 on: October 28, 2024, 04:33:19 PM »
CPU limited (is a six years old cpu), Threadripper has plenty of pcie lanes (64).

The last slot you are running is at 4 Gbps speed. So pretty bottle necked.

That slot was for my sound card before.
I said in a previous post that my cards were in two slots at 16x (16gb/s) and one at 8x (8gb/s).

No it can not, in the manual for the motherboard it gets limited to PCI 2.0, You should read the manual for the motherboard when using PCI slots.

Bzuco

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #20 on: October 29, 2024, 01:12:02 AM »
4Gbit is not 4Gbytes, its 0.5 so it is extremely slow and unusable for any work. As the motherboard limits the slot to PCI 2.0
If it limits that slot to 2.0 standard, then it is still 2GB/s which is enough speed for uploading data to VRAM.
« Last Edit: October 29, 2024, 01:50:45 AM by Bzuco »

olihar

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #21 on: October 29, 2024, 02:27:03 AM »
4Gbit is not 4Gbytes, its 0.5 so it is extremely slow and unusable for any work. As the motherboard limits the slot to PCI 2.0
If it limits that slot to 2.0 standard, then it is still 2GB/s which is enough speed for uploading data to VRAM.

Its the bottle neck.

tutoss

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Re: AMD 7900XT low gpu usage on Align Photos and Build point cloud
« Reply #22 on: October 29, 2024, 04:05:29 AM »
The last slot you are running is at 4 Gbps speed. So pretty bottle necked.
Metashape doesn't need to transfer 4GB every second between RAM and VRAM , so it is still OK.

4Gbit is not 4Gbytes, its 0.5 so it is extremely slow and unusable for any work. As the motherboard limits the slot to PCI 2.0

I installed the cards in the pcie 3.0 ports, 16x and 8x speed, I don't know where you get that I installed a GPU it in the bottom port (physically impossible with any of my cards) that works at pcie 2.0 4x. There I put the sound card...
« Last Edit: October 29, 2024, 04:10:09 AM by tutoss »