For now I have Corsair TwinX2048-3200C2PT running at 250Mhz 3-4-4-8. CPU is Athlon 64 X2 3800+ @2.5Ghz (250x10/ FSB:RAM ratio 1:1). I have a chanse to add another gig of Corsair TwinX1024-3200C2PT. I know that A64 memory controller will switch to T2 with 4 full dimms. So I have a question: would my memory (3Gb) be able to run at DDR500 3-4-4-8 without changing FSB:RAM ratio, cause I have heard some info that T2 reduses memory overclockability?
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The controller wont switch to 2T, you need to do that or it may not even boot.
Changing the timing to 2T doesnt reduce overclockability, if anything it will improve it compared to having the same 4 modules at 1T, as it removes this one timing from your limit.
Running 4 ram modules may not clock as well as 2 modules.

Chances are, even with 2T, 4 modules wont clock as fast as 2.
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Command rate is only really noticeable in benchmarks. In real world usage, you'll never see the difference between 1T vs 2T.
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You need to be very careful here.

the TwinX C2 series came in several revisions. The revision you get dictates which modules it uses, and ultimately how overclockable it is.

the 2048 kit you currently have likely has Samsung TCCD chips.

with regards to the 1024 kit, I have one that uses winbond bh5. it cannot be overclocked at all unless you run insane amounts of voltage in it (at least 3.2 volts).

In short, it is not a good idea to get them. they will likely have completely different chips inside that will not be able to overclock like the modules you have now.
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You need to be very careful here.

the TwinX C2 series came in several revisions. The revision you get dictates which modules it uses, and ultimately how overclockable it is.

the 2048 kit you currently have likely has Samsung TCCD chips.

with regards to the 1024 kit, I have one that uses winbond bh5. it cannot be overclocked at all unless you run insane amounts of voltage in it (at least 3.2 volts).

In short, it is not a good idea to get them. they will likely have completely different chips inside that will not be able to overclock like the modules you have now.
Agreed, mixing the memory is not a good idea.
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