This forum page should help. The 755 SFF PCIe x 16 slot is only rated for 25W so the RX 6400 will not work as it draws 53W. This page at Amazon has a picture of the MB and it is clearly stamped 25W.
low profile rx6400 for sff case seems to be 1.5 slot width. Physically it may not be able to fit 755 sff which has very tight space. only thin single slot width card may fit
The cpu in 755 (core 2) is also too slow for gt1030 or rx 6400. cpu will bottleneck the gpu. if you are getting poor fps now in gt1030 it is because of old slow cpu. upgrade gpu won’t help.
NVIDIA GeForce GT 1030
Benchmark CPU
Intel Core2 Duo E8400 @ 3.00GHz
CPU Impact on FPS
-8.2 FPS
CPU Impact on FPS %
-40.0%
Benchmark Quality Settings
High Quality Settings
Average 1080p Performance
25.1 FPS
NVIDIA GeForce GT 1030
Benchmark CPU
Intel Core2 Quad Q9650 @ 3.00GHz
CPU Impact on FPS
-8.2 FPS
CPU Impact on FPS %
-40.0%
Benchmark Quality Settings
High Quality Settings
Average 1080p Performance
25.1 FPS
otoh the 25w print on motherboard stems from the small oem psu in sff. if you upgrade psu which has to sit outside sff case, it can support a gpu up to 75w tdp without PCIe connector.
JOcean
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12.3K Posts
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January 3rd, 2023 04:00
This forum page should help. The 755 SFF PCIe x 16 slot is only rated for 25W so the RX 6400 will not work as it draws 53W. This page at Amazon has a picture of the MB and it is clearly stamped 25W.
redxps630
9 Legend
9 Legend
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12.3K Posts
0
January 3rd, 2023 07:00
low profile rx6400 for sff case seems to be 1.5 slot width. Physically it may not be able to fit 755 sff which has very tight space. only thin single slot width card may fit
The cpu in 755 (core 2) is also too slow for gt1030 or rx 6400. cpu will bottleneck the gpu. if you are getting poor fps now in gt1030 it is because of old slow cpu. upgrade gpu won’t help.
otoh the 25w print on motherboard stems from the small oem psu in sff. if you upgrade psu which has to sit outside sff case, it can support a gpu up to 75w tdp without PCIe connector.