Well, it is obvious, let me explain.
1)A 1900XT/XTX will bottleneck him CPU.
2)But, a 1900XT/XTX will make his games run faster than any other card which is inferior to the 1900XT/XTX. This means that although he can't make full use of the 1900XT/XTX, he can still get some performance with which he can differentiate between other cards like the 1800XT if used with the same CPU. So now it is clear that although his CPU can't make full use of a 1900XT, his games will surely run faster with the 1900XT than with the 1900XTX, however, to a limited extent.
3)From this we come to the conclusion that anything above a 1900XT with his CPU will either give a very small performance boost or will not give a performance boost at all. Now, 1900XTX does cost significantly over a 1900XT but performs in most cases un-noticeably better. Now since his CPU is anyways limited by a 1900XT, even if he uses a 1900XTX instead, he won't notice much of a difference if at all in real world benchmarks. In fact even if he had a E6400 he might have only noticed a 5-10% performance gain on average. However, since his CPU can't make use of the 1900XT fully anyway, 1900XTX may only give a small performance boost of maybe 0-10% on average making it un-necessary to spend that much extra on it. Rather, he would benefit more by saving and spending that money later.
4)Just because I am having problems doesn't mean that the hardware in general goes bad. Advise is given for 99% cases and not a 0.01% exceptional case.
5)Back to him again. As of today games can do fine with his CPU as that is all the horsepower they need when complemented by a powerful card. However in the near future the games released will heavily use newer AMD 64 and mostly Core 2 Duo and dual core X2s that his card will become a severe bottleneck to his performance and would in fact increase the bottleneck the CPU causes him.
6)AFAIK any game with any config will run better at 10X7 than at 16X12.
7)His CPU might not be able to do that well at 16X12 as it would on 12X10.
1)A 1900XT/XTX will bottleneck him CPU.
2)But, a 1900XT/XTX will make his games run faster than any other card which is inferior to the 1900XT/XTX. This means that although he can't make full use of the 1900XT/XTX, he can still get some performance with which he can differentiate between other cards like the 1800XT if used with the same CPU. So now it is clear that although his CPU can't make full use of a 1900XT, his games will surely run faster with the 1900XT than with the 1900XTX, however, to a limited extent.
3)From this we come to the conclusion that anything above a 1900XT with his CPU will either give a very small performance boost or will not give a performance boost at all. Now, 1900XTX does cost significantly over a 1900XT but performs in most cases un-noticeably better. Now since his CPU is anyways limited by a 1900XT, even if he uses a 1900XTX instead, he won't notice much of a difference if at all in real world benchmarks. In fact even if he had a E6400 he might have only noticed a 5-10% performance gain on average. However, since his CPU can't make use of the 1900XT fully anyway, 1900XTX may only give a small performance boost of maybe 0-10% on average making it un-necessary to spend that much extra on it. Rather, he would benefit more by saving and spending that money later.
4)Just because I am having problems doesn't mean that the hardware in general goes bad. Advise is given for 99% cases and not a 0.01% exceptional case.
5)Back to him again. As of today games can do fine with his CPU as that is all the horsepower they need when complemented by a powerful card. However in the near future the games released will heavily use newer AMD 64 and mostly Core 2 Duo and dual core X2s that his card will become a severe bottleneck to his performance and would in fact increase the bottleneck the CPU causes him.
6)AFAIK any game with any config will run better at 10X7 than at 16X12.
7)His CPU might not be able to do that well at 16X12 as it would on 12X10.