Possibly looking for 1260 card

[stefcep2]

To deviate ever-so-slightly from the subject at hand, does anyone know how an A4000 with 25MHz 040 compares with 50MHz 060 of the later A4000?

I've had both, and the 68060 is so much quicker in everything-particularly if you have an A3640 with its crippled memory bus.  

And YES AGA draw functions are faster on the 68060 too, I once knew why, but not now, sorry.  And i'm not talking about C2P, i mean even things like scala and dpaint which bang the AGA chipset directly are smoother and faster with graphical functions.

it really is a new order of performance when you go from the '040 to the '060.

[stefcep2]

Yeah, no sh!t the '060 is a faster processor.

I was responding specifically to Iggy's comment about chipset access, which is generally better with the '030 cards.

Blizzard 1260/50:

chip $000F0000 readw 1328.7 ns normal 1.5 * 10^6 byte/s
chip $000F0000 readl 1329.4 ns normal 3.0 * 10^6 byte/s
chip $000F0000 readm 1332.9 ns normal 3.0 * 10^6 byte/s
chip $000F0000 writew 1119.2 ns normal 1.8 * 10^6 byte/s
chip $000F0000 writel 1118.9 ns normal 3.6 * 10^6 byte/s
chip $000F0000 writem 1121.8 ns normal 3.6 * 10^6 byte/s

Blizzard 1230/50:

chip $000F0000 readw 903.4 ns norm 2.2 * 10^6 byte/s
chip $000F0000 readl 903.7 ns norm 4.4 * 10^6 byte/s
chip $000F0000 readm 636.4 ns norm 6.3 * 10^6 byte/s
chip $000F0000 writew 575.6 ns norm 3.5 * 10^6 byte/s
chip $000F0000 writel 574.8 ns norm 6.9 * 10^6 byte/s
chip $000F0000 writem 575.3 ns norm 7.0 * 10^6 byte/s


@Franko



Never heard of the demoscene?

Nor sure if we're talking about the same thing, but I know I read a review of various '60 boards in one of the mags back in the day which did some benchmarks that proved the '060 did improve AGA functions over all other processors, and the weird thing was that which functions were improved and by how much depended on the exact card in question.

[stefcep2]

What's the issue with the memory bus?  It's not also 25 MHz??

The A3640+A4000 motherboard combination results in very slow ram access to the motherboard fast ram.  Check out the Aminet AIBB modules for RAM speeds for A4000's with the A3640 compared to any other 68040 accelerator, all of which have their own on-card RAM sockets.  Outside of benchmarking software, you really feel the slow ram access, from hard drive loading times, to screen re-draws on graphics cards.