DDR400 on a Mobo supporting DDR266

[ggab]

I have a mobo which supports DDR266 (Asus A7V266-C with VIA KT266A).
can i get a ddr400 stick and use it on it?
wont it just run at DDR266 (133mhz x 2) but with better timings taken from the SPD??
Or will it not boot at all?



from a specteck's pdf>
ddr266 & ddr333
VDD = +2.5V ±0.2V, VDDQ = +2.5V ±0.2V (For –6A & -75A)
ddr400
VDD = +2.6V ±0.1V, VDDQ = +2.6V ±0.1V (For -5B)


maybe the VDD, is a problem......
my mobo supports ram's modules @ VDD = +2.5V ±0.2V, ??? (i guess yes)

but ddr400 (5ns) is VDD = +2.6V ±0.1V,...
so, this ±0.1V... = 2.6v - 0.1v = 2.5v...(i'll getting the appropiate voltage...)



second alternative is:
with ddr333, it might work, no? (theorically it should work just fine?)


PS: someone has a similar issue, with bad results:
http://www.abxzone.com/forums/archive/index.php/t-82113.html


Thanks

 

[-Shadow-]

Normally, PC400 ram should work fine on a PC266 Mainboard. The ram normally gets underclocked to the board's maximum of 266Mhz DDR. The voltage shouldn't be a problem either, because of the fact that the ram bar runs much slower than it could. The same here for PC333.

A possibility why your suffering comrade has problems with PC400 ram bars on a PC266 Mainboard could be that his Mobo is completely incompatible with the memory brand.

 

[sheik124]

shadow, DDR400 is NOT PC400, its PC3200, and DDR266 is PC2100
ggab, it should work fine, right now in my sister's pc that has a cpu that is 333 MHz FSB i have two sticks of DDR466 in there becuase that is the only ram i had onhand, it just runs underclocked with better timings

 

[Stezo2k]

Yeah, it'll work fine don't worry about it

Getting faster memory always helps anyway for when you go to upgrade

 

[ggab]

one more

generic DDR400 ram only support CL2.5 & 3.0?

my mother allows me set only cas latency of 2 & 2.5,....

could someone, who gets a generic (brand) DDR333 or 400 module, use sandra 2004 sp2b, goes to Mainboard information and finds how many Mhz are in CL 2.5/CL2.0 etc.?
example
CL2 up to 133mhz
CL2.5 up to 166mhz
CL3 up to 200mhz