JogaBonito1502
Guru
- Messages
- 7,841
- Location
- U.S.
That's not what I said. I know it's a dual core, however desktops C2D (Core 2 Duo) are quad-pumped. All quad-pumped means is that your processor can access the memory sub system 4 times a cycle. Therefore systems that are quad-pumped have their FSB Clock divided by 4 when accessing memory. Because DDR is Dual Data Rate, you divide the actual speed by 2 to get the data rate.
(The RAM and the CPU speed ratio must be 1:1 in order for the system to be stable. When I said that Mobile C2D were dual pumped was because I was ignorant of what the pumps actually were. When I looked up on it, I figured out that dual and single pumps are really old. Most of the processors today are quad-pumped.)
So in your case:
800MHz FSB Quad-pumped = 200MHz per pump.
To get your RAM to match you would need something that does 200MHz per pump. Because modern single rate memory (not SDRAM) did 2 "pumps" a cycle they had to create Double Data Rate memory. In your case 400MHz will do 2 200MHz pump, and since it's Double Data Rate, it will double the data rate (which does 2 pumps a cycle) thus doing 4 200MHz pumps and matching the CPU FSB perfectly. With that being said, you won't need anything higher than a DDR2 400MHz RAM.
(The RAM and the CPU speed ratio must be 1:1 in order for the system to be stable. When I said that Mobile C2D were dual pumped was because I was ignorant of what the pumps actually were. When I looked up on it, I figured out that dual and single pumps are really old. Most of the processors today are quad-pumped.)
So in your case:
800MHz FSB Quad-pumped = 200MHz per pump.
To get your RAM to match you would need something that does 200MHz per pump. Because modern single rate memory (not SDRAM) did 2 "pumps" a cycle they had to create Double Data Rate memory. In your case 400MHz will do 2 200MHz pump, and since it's Double Data Rate, it will double the data rate (which does 2 pumps a cycle) thus doing 4 200MHz pumps and matching the CPU FSB perfectly. With that being said, you won't need anything higher than a DDR2 400MHz RAM.