Reply 30600 of 30758, by MattRocks
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Ozzuneoj wrote on 2025-12-27, 23:09:MattRocks wrote on 2025-12-27, 22:58:Ozzuneoj wrote on 2025-12-27, 22:42:Still hoping someone can chime in on this one. To summarize: PNY FX 5200 128MB (128bit) card reporting only 64MB (64bit) in BIOS […]
Still hoping someone can chime in on this one. To summarize: PNY FX 5200 128MB (128bit) card reporting only 64MB (64bit) in BIOS and in Windows. No visible damage or defects of any kind on it and it otherwise works flawlessly, though obviously with 64bit performance.
Interestingly, I actually found another identical PNY card that properly reports 128MB and get this: There are no obvious differences to the PCB layout or components. In fact, the one that reports the full 128MB actually has a couple of tiny SMD caps snapped off the back from being in a scrap lot. Those apparently don't affect anything at all because the card works perfectly and is clearly faster than the one using only half its memory. And before you ask... yes, they are clearly broken off and not intended to be missing.
The BIOS files also seem to be identical between the cards.
Anyone have any ideas? I have used my microscope and inspected the card quite thoroughly but I can't find any broken components or any visible damage.
I'm wondering if maybe a solder joint on one of the memory chips has broken and it is one that doesn't introduce any errors but it disconnects the other 64MB... I have no idea if this is possible.
Here is the datasheet for the memory chips.
https://www.alldatasheet.com/datasheet-pdf/vi … 281622DT-5.html
I have looked it over and nothing obvious is jumping out at me like "if this is disconnected you lose megabytes" 😅. If anyone is feeling brainy and wants to offer any input, I'd love some theories at least.Try Linux kernel logs; Linux might reinitialise the GPU and repeat whatever the VBIOS did at POST. The big difference being one has logs, one doesn't. Good news is you can generate two sets of logs with your two cards and diff them 😀
I haven't used Linux in 20+ years (unless you count Android 😋).
I kind of doubt that OS logs would be able to identify anything that runs deeper than the card BIOS. It is likely a physical defect of some kind, not a software or firmware issue.
If the VROM image is identical, and the physical VRAM is identical, then the fault has to be something between VBIOS and VRAM - such as resistors?