OK, I tested few more beasts
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top: X600 / bottom: X1300PRO
X600
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The X600 is pretty much identical to the previous X300SE except for the memory which is now 128bit (with a little higher clock).
This alone was enough to greatly exceed the overclocked X300SE results, since it was heavily limited by the memory bandwidth
As for the overclock, this RV370 managed to reach almost 500Mhz, which makes for a +52%, not bad!!
The RAM was a surprise, 324MHz for 4ns modules is not obvious at all! (I was hoping for 275, maybe 300)
X1300PRO
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The RV516 of the X1300PRO has the same 4/2/4/4 configuration of the X300/X600 (RV370) with some architectural improvements here and there I guess
Other than that it's also able to clock higher (mainly because of a the "new" 90nm production process I think)
Anyways, also here what is giving a good boost is the memory, now DDR2 at 392MHz
As for the overclock, the GPU limit was around 690, so no extreme increases (from what I can see ~700MHz is a general limit for R500 series, at least without voltage control)
The RAM instead did pretty well, ~520MHz for 2.5ns (400MHz) modules is quite good for me!
also did a 3DMark03 on this one, if somebody wants to compare with other cards
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(A64 X2 4400+)