[MEncoder-users] Fwd: Questions on Mencoder performace

[larrystotler at netscape.net]

-----Original Message-----
From: Matthias Wieser <mwieser at gmx.de>

I don't know if 256k is too less for mencoder but generally speaking 
mencoder does not need much cache. An Athlon with 1MByte of cache is 
not
faster than a 512k version.  It's all about CPU clock, CPU architecture 
and memory bandwidth.

That's the problem.  No one seems to know the answer.  I definately 
know that moving from 512k to 2048k on my Xeons made no difference.  
However, even tho they are full speed L2, they only have a 64bit bus.  
The chips with the L2 on the chip have a 256bit bus, which should make 
them faster.  Therefore, a 256k L2 P3 500 should be as fast as a 1MB L2 
Xeon 500 off chip.  Less cache, but faster access.  A freind has a P4 
1.8 that we overclocked to 2.4, but he's waiting on a better 
heatsink/fan for it.  I will try it on his when he gets it. It has 
512k, so it should be comparable to the Celeron. And, it has SDRAM 
instead of DDR, so that should make it a closer test.  If the P4 is 
faster, it would have to be because of the extra cache or the 133Mhz 
bus since the celeron is using 100x24.  The 1.8 was 18x100,but it's 
overclocked at 18x133.

>>   How much does memory speed impact performance?

>much.

So, DDR should show more performance than SDRAM?
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