So i have this old Pentium 3 compactable motherboard with old Celeron on it and old ddr2 and ddr memory and old ATI Radeon 7200 if im no wrong its 32mb
With so old hardware the only issue you may face is having maximum pci-e v2.0 slots, while newer systems have pci-e v3.0 slots. But, the video card is backwards compatible with pci-e v2.0 slots and my guess the performance decrease is less than 1%, much less than pci-e x16 vs pci-e x8 difference.
Depending on the video card driver, the processor may limit the performance a bit, recent drivers are more optimized for more cores and higher frequency per core.
If the games run slow, i suggest trying out some of the first drivers that support that video card model, often later drivers add more features and patches for various games and slow things down etc.
So i have this old Pentium 3 compactable motherboard with old Celeron on it and old ddr2 and ddr memory and old ATI Radeon 7200 if im no wrong its 32mb