[kikujiro]

dal forum di hocp, un post abbastanza illuminante:

[topic ddr vs rdram]

Alright, I am going to give my current position on this topic:

Currently, the fastest DDR SDRAM is rated for 333MHz. This is normally used with an external clock of 125MHz and a 3:4 (FSB:Memory) memory ratio. Some are running their memory at 352MHz without any problems. The limit of this memory will likely be somewhere around this range, possibly a bit higher. Additionally, some motherboards restrict you to a maximum of 352MHz for DDR SDRAM.

Based on the above, I form the following opinions:

For overclocks over about 32%, an RDRAM system is really the only way to go. Any higher than this with DDR SDRAM is not guaranteed by any means. The memory is specced to work at a 25% processor overclock. You will likely run into the memory ceiling before hitting the processor ceiling.

For overclocks of 0% to 25%, RDRAM should run fine at the 4x RDRAM multiplier. Thus, it would still be the clear choice for the most bandwidth, head and shoulders above the DDR SDRAM. (At a 25% overclock, the RDRAM would offer 4GB/s of memory bandwidth. The DDR SDRAM would offer 2.67GB/s of memory bandwidth. That is a significant difference.)

For overclocks between 25% and 32%, DDR SDRAM gets pretty close to RDRAM's bandwidth due to the required 3x RDRAM multiplier. I am willing to say that if you are aiming for that range, either one will do fine.

Taking all of this into account, I really have to recommend RDRAM to anyone who does not already have a few sticks of DDR SDRAM lying around. Not many people who overclock plan to aim for between 25% and a bit over 32%. Most want more than this. Even if you do end up in that area, RDRAM still maintains a small bandwidth lead, so it really is not a gamble. Additionally, anyone who is not overclocking will see considerably more bandwidth from RDRAM (3.2GB/s) than they will from DDR SDRAM (2.1GB/s.)

To sum up, I maintain that RDRAM is the way to go if you have no current investment in either memory type and are looking to make a purchase.

-Raystonn

resta cmq il fatto che se hai un paio di stick di crucial di conviene rimanere sul DDR.