I regret I do not have the video card / adaptor. I think the manufacturer should have included information about it in the Excelerator manual, and that way more people would have known about its existence and perhaps increased sales of it ?? But they didn't... I do have the 68851 though, and a 16MHz 68881.
I uploaded some of the more significant and less intuitive pages of the manual. The SIMM distribution on the motherboard (two SIMMs, and two SIMMs only, have to be on the motherboard) is different depending on which version of the SE motherboard is present, i.e. front row for one SE motherboard version, and back row for the other SE version.
There is going to be more information in a separate thread on 1988 SE accelerators in general which I am about to try to create.
In this other thread, where I am uploading a report, there is a picture of the early 1988 Orion accelerator in the bottom right on the second page of the report. If that picture is compared with the pictures of the board at the start of this thread you can see they are two different but similar boards. The main difference is that the 68851 is located between the 68020 and 68881 on one version of the board, but the 68020 is located between the 68851 and 68881 on another version of the board. The board in the original pictures in this thread and the board I have both are the 68020 between the 68851 and 68881 type, although there is at least one other difference.
As mentioned, the strength of this accelerator in particular is that unlike its competitors at the time it had 8 SIMM sockets, the others didn't, mostly the others carried no provision for memory expansion.