Some time ago ( a year maybe?) i read this really great article on unknown website with benchmarks concerning what happens when you use more than 1 gig of ram with intel and amd processors. the contents of the article are vague but i remeber that the p4 was adversly affected in about half the benchmarks (i know sandra mem benches were among them) and the AMD machine was effected the other half of the time.
so im looking for this article because i cant remeber if the benchmark was done on an amd 64/opteron or if it was done on a barton core or older athlon xp.
the findings were quite clear that after you add more than 1 gig of ram to a system it would cut the bus width in half on a p4 to 32 bits and though many things werent effected some benchmarks were drastically effected. Though i dont remember about the amd machine in spesific i do remember that it was effected similiarly but in different benchmarks and that the method of adressing more than a gig of memory was different.
what i want is a link to the article, not a discussion on y 32 bit processors can physically adress 4 gigs of ram cause i know that they can just not at full speed depending on the processor.
i found out this info while searching for many hours for this lost article that discusses similiar issues with the pentium 2 processors and how when using more than 512 megs of ram the L1 cache and L2 cache would have to be disabled to adress that much and there fore performance dropped so much that it was never worth it.
thank you for your time and expertice
Pinki
so im looking for this article because i cant remeber if the benchmark was done on an amd 64/opteron or if it was done on a barton core or older athlon xp.
the findings were quite clear that after you add more than 1 gig of ram to a system it would cut the bus width in half on a p4 to 32 bits and though many things werent effected some benchmarks were drastically effected. Though i dont remember about the amd machine in spesific i do remember that it was effected similiarly but in different benchmarks and that the method of adressing more than a gig of memory was different.
what i want is a link to the article, not a discussion on y 32 bit processors can physically adress 4 gigs of ram cause i know that they can just not at full speed depending on the processor.
i found out this info while searching for many hours for this lost article that discusses similiar issues with the pentium 2 processors and how when using more than 512 megs of ram the L1 cache and L2 cache would have to be disabled to adress that much and there fore performance dropped so much that it was never worth it.
thank you for your time and expertice
Pinki
) and I don't recall anything that really fits your description. I've personally run 1.5GB of RAM in an nForce2 system and there are plenty of other folks around here who've run 1.5GB+ as well. I'm pretty sure you'd hear them hollering bloody murder if it resulted in halved memory-bus width. 
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