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Home Forums Quadra (700, 900, 950) & Upgrades — #21 Quadra (700, 900, 950) & Upgrades — #21
Post #21 by trag
Source ForumQuadra (700, 900, 950) & Upgrades — #21
Category68k
Post DateTue, 16 Dec 2014 - 16:55
Original URLhttps://68kmla.org/bb/threads/quadra-700-900-950-upgrades.643/
Post
trag: ArmorAlley's Quadra 605 isn't overclocked - the motherboard runs at the stock 25 MHz and only the CPU runs at 50 MHz by way of the Quadra Overdrive, so there wouldn't be any issues with VRAM.

I've overclocked many Quadra 605s to 40 MHz, but because I typically don't have monitors, 832x624 at black and white is fine. Some of the issues I've seen are resolutions not working at all, the picture getting cut off 40 or 50 pixels from the right side, higher color depths causing loss of sync and so on. It can be quite interesting!
Thank you for the clarification John.   Any idea what speed VRAM is needed to guarantee proper operation at 40 MHz?  I think I read that 80ns would do the trick, but my memory is hazy.

mp.ls