You miscounted the slot on the main board. It is 49/11, not 59/11. This is the standard layout of a PCI slot with 5V signalling voltage. The sound card is made for that type of slot. The last 4 pins (per side) are just additional power pins and 64-bit negotiation pins that are not needed. The sound card omits the last 4 pins per side to be smaller, which is cheaper to manufacture.

Generally, for PCI slots, and for PCIe slots (only the latter ones may have a different number of lanes), the rule of thumb is: If it fits mechanically (this includes that the slot bracket ending up at the cutout in the case), it will work. If the fit is loose (i.e. the card can be moved forward and backward in the slot) or the slot bracket would end up inside the computer instead of at the case edge, the card is unsuitable for that slot, and powering on the system may damage the card and/or the mainboard.

What a relief. None of the pages on PCI (wikipedia, users, faqs, companies making them, etc.) say that part, that if it fits it will work. One would think that would be an important detail.

The card I have (nor any other) could physically fit inside the 5710, even with an angled riser. But if it will work with a riser cable (will it?), that would be good enough.

Now the hard part is finding the cable. Luckily, I live in Taipei, Taiwan, where a lot of this stuff is made.

If you talk about the 5170 IBM AT Mainboard: That board has ISA slots only, there is no sane way to get PCI cards working in it. On the other hand, if you have an AT-style 486 or Pentium motherboard with PCI slots, and you mount that board in a 5170 case, the PCI cards should fit without the need of a riser card.

mkarcher wrote on 2025-01-14, 23:30:

If you talk about the 5170 IBM AT Mainboard: That board has ISA slots only, there is no sane way to get PCI cards working in it. On the other hand, if you have an AT-style 486 or Pentium motherboard with PCI slots, and you mount that board in a 5170 case, the PCI cards should fit without the need of a riser card.

HP t5710, not IBM 5170. It's a thin client with one (5V) PCI slot.

Bob Dog wrote on 2025-01-14, 20:55:

The card I have (nor any other) could physically fit inside the 5710, even with an angled riser. But if it will work with a riser cable (will it?), that would be good enough.

If you get an angled riser board and a bigger case (scroll to the bottom), which was available as option, a PCI card will fit. Sorry for the answer regarding the IBM 5170, I didn't have the OP still in mind, and I was afraid that someone might try to somehow bodge a PCI card into an ISA slot, break the system and blame me for saying "if it fits, it works".

dionb wrote on 2025-01-15, 01:15:

HP t5710, not IBM 5170. It's a thin client with one (5V) PCI slot.

Thanks for pointing that out.

Bob Dog wrote on 2025-01-14, 20:55:

What a relief. None of the pages on PCI (wikipedia, users, faqs, companies making them, etc.) say that part, that if it fits it will work. One would think that would be an important detail.

The card I have (nor any other) could physically fit inside the 5710, even with an angled riser. But if it will work with a riser cable (will it?), that would be good enough.

Now the hard part is finding the cable. Luckily, I live in Taipei, Taiwan, where a lot of this stuff is made.

You can make one if you cant find one to buy.