Well, they may be more fair about posting real benchmarks and tech info about their products (like Individual Computers does), but it's very good about their commitment on the Amiga side.
The software for adding the part of gfx card SDRAM to Amiga system memory was already released -- and was released for free for all Mediator users. So, each user of Mediator for A1200 (or A3/4000) with any supported PCI gfx card can check this speed in his specific config.
The speed of the Radeon SDRAM configured as Amiga 1200 system memory is on about the same level as in A3000 and A4000 computers. Benchmarks of the Radeon memory configured as Amiga system memory were posted on Amiga.org in
this thread.
The SDRAM memory on the Radeon card is accessible from three sides: 1) from Amiga processor, 2) from the busmaster PCI cards, 3) from the Radeon gfx chipset.
1) The speed of this memory from Amiga processor accesses is limited by hardware design of the Amiga 1200 CPU slot interface of the specific turbo card. This speed varies from 5 MB/s to 13 MB/s depending of the turbo card model.
2) The speed from PCI busmaster cards sitting in the PCI slots of Mediator busboard is limited by gfx card design. For Radeon 9200 based on M9+ chipset write speed is up to 128 MB/s (in the burst mode), read speed is up to about 50 MB/s.
3) The SDRAM speed when accessing from M9+ core is up to 4 GB/s.
