you need to understand. The FPU of the duron/athlon are far far better than Pentium 3's. Max 3 has NO optimizations in the renderer for SSE. The renderer uses pure fpu instructions for processing. max3 and max4 have pentium 3 optimizations for _software_ (hiedi driver) rendering for viewports. You get about 25% gain using the SSE software driver over non SSE. Nvidia, ati, 3dlabs... have their drivers optomized for SSE as well so you see a performance gain in opengl when you have a p3. I have emailed discreet (ktx back when max3 was released) about this and they told me that the renderer doesn't and can't take advantage of SSE.
Again, the renderer uses pure FPU to render. At same clock, the P3 is 300mhz behind the duron/athlon FPU seen here.
http://www4.tomshardware.com/cpu/01q1/010108/images/3dsmax.gif
When rendering in max, dual processors enjoy a 100% boost. Meaning, if you have a P3 500 that renders 20ppr you will get double that 40ppr
So if you have dual 1ghz you pretty much have 2ghz rendering power. Not in viewports though, I'll get into that.
Those renderer benchmarks are with a 100fsb duron/athlon and 133fsb intel chips. Running at 133fsb with duron/athlon will put those numbers up quite a bit, I'd speculate that running a athlon at 1.5ghz @133fsb would at least be like a 1.550ghz 100fsb athlon. I think that is fairly modist. So the total mhz of a dual 1ghz P3 system compared to an athlon 1.5@133 is 450mhz. Minus the 300mhz FPU performance of the P3 you are left with 150mhz boost. That will get you about 19 pages more in an hour. Nice boost in performance I’ll admit.
Viewports, now I am only speaking from discreets 3dsmax experience and knowledge but I imagine most 3d apps would use duals the same way. I can only speak from high end nvidia products and not from any 3dlabs professional cards. Plz let me know if it works differently with the special drivers. Max will split the cpu needs to each processor by assigning one viewport per cpu. If you have 4 then 2 go to each cpu. This is fast because you get no delay switching between viewports and you can play back 2 or more viewports back at once faster. So in this case, you really on have a 1ghz P3 FPU powering a viewport at one time (which you only need to deal with one at a time the majority of the time anyway). I’d rather have the 1.5ghz athlon FPU shooting those poly’s and other things around.
Now comes a really driving force for me, other may not have a problem with this but I do.
As per pricewatch
Intel Pentium 3 1ghz - $220
AMD Athlon Tbird 1ghz - $131/$145 100mhz/133mhz
Those prices are the lowest you can get around pretty much. Buying a dual board will cost a lot more than a single cpu mobo, plus you need 2 $220 cpu’s. Your average price per system going intel is quite a large sum of money. Between $300-$400 at least. For getting 150mhz more rendering power you sure do spend a lot more.