All the measurements I was able to do in the short time were glxgears and fgl_glxgears .... (stand-alone & running them simultaneously)
Based upon that, I would guesstimate the 3850 AGP to have been about 1.5x to 2.5x faster than my 2600XT AGP (both with 512 MB GDDR3 memory on-board).
Side-note: my 2600XT AGP is the H.I.S. IceQ Turbo overclocked edition (so overclocked in hardware, e.g. even in Linux, rather than via the Windows driver)
so performance gains coming from a "normal" 2600XT or Pro may be slightly bigger.
I use mostly Windows XP for gaming and therefore graphical benchmarking (The few Linux OpenGL apps/games I mentioned are what I can use / play when my PC is booted into Linux doing other stuff in the background which is the common situation most of the time)
Unfortunately Windows Service Pack 3 broke my XP install (no, I do not have the AMD + Intel power management driver issue, it's much worse)
so I couldn't benchmark for want of having to re-install XP.
All in good time, assuming I get a working 3850 AGP back rather than my money ....



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