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#1
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SDRAM versus DDR
Dave wrote:
I have got 768 MB of SDRAM (133 MHz) on my system. If I go to a DDR mobo then how much 3200 DDR-400 would I need to get to roughly match the performance of the SDRAM? Depends on whether the things you do are most dependent on the RAM speed or the RAM quantity. If you do things like video editting, the more RAM the better, even if you have to settle for something a little slower than PC3200. If you do mostly gaming (plus trivial stuff like word processing and web browsing) then 512 MB of low latency PC3200 should do you very nicely. |
#2
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Rob Stow wrote in message ...
Dave wrote: I have got 768 MB of SDRAM (133 MHz) on my system. If I go to a DDR mobo then how much 3200 DDR-400 would I need to get to roughly match the performance of the SDRAM? Depends on whether the things you do are most dependent on the RAM speed or the RAM quantity. If you do things like video editting, the more RAM the better, even if you have to settle for something a little slower than PC3200. If you do mostly gaming (plus trivial stuff like word processing and web browsing) then 512 MB of low latency PC3200 should do you very nicely. As a general rule, the greater the memory bandwidth, the faster your code will run. However, it isn't that simple. A lot will depend upon how well your program utilizes the on-chip caches. Typically, cache hit ratios are around 90% or better. This means that 9 times out of 10, the data or instruction that you need will be in cache. This is independent of SDRAM or DDR memory. Now, if you get a cache miss and have to go to memory, then you will see the speed of memory. Or, if you are doing a lot of disk intensive activity, the memory speed could come into play. In any case, it isn't a 1:1 relationship between memory bandwidth and code execution speed. arnie |
#3
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Video editing is not particularly memory intensive, it's much more CPU
intensive. Rob Stow wrote: Dave wrote: I have got 768 MB of SDRAM (133 MHz) on my system. If I go to a DDR mobo then how much 3200 DDR-400 would I need to get to roughly match the performance of the SDRAM? Depends on whether the things you do are most dependent on the RAM speed or the RAM quantity. If you do things like video editting, the more RAM the better, even if you have to settle for something a little slower than PC3200. If you do mostly gaming (plus trivial stuff like word processing and web browsing) then 512 MB of low latency PC3200 should do you very nicely. |
#4
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Barry Watzman wrote:
Video editing is not particularly memory intensive, it's much more CPU intensive. Video editting when you don't have enough RAM to hold all or at least a large portion of the clip in RAM is a painful process. A clip doesn't have to be very big before even 4 GB of RAM is not enough, especially since you don't work with compressed streams like AVI or MPEG files - you do your editting and then compress/encode the final product. Video encoding/compression, by contrast, needs relatively little RAM and is more dependent on raw cpu MHz. Rob Stow wrote: Dave wrote: I have got 768 MB of SDRAM (133 MHz) on my system. If I go to a DDR mobo then how much 3200 DDR-400 would I need to get to roughly match the performance of the SDRAM? Depends on whether the things you do are most dependent on the RAM speed or the RAM quantity. If you do things like video editting, the more RAM the better, even if you have to settle for something a little slower than PC3200. If you do mostly gaming (plus trivial stuff like word processing and web browsing) then 512 MB of low latency PC3200 should do you very nicely. |
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