SDRAM (Synchronous DRAM)
P-III systems used to 3.3 volt, 168-pin SDRAM DIMMs. SDRAM started out running at 66 MHz. SDRAM is able to scale to 133 MHz (PC133) up to 180MHz or higher.
DDR (Double Data Rate SDRAM)
DDR basically doubles the rate of data transfer of standard SDRAM by transferring data on the up and down tick of a clock cycle. DDR memory operating at 333MHz actually operates at 166MHz * 2 or 133MHz*2. DDR is a 2.5 volt technology that uses 184 pins in its DIMMs..
Rambus DRAM (RDRAM)
Intel has given RDRAM it's for the consumer market, and it will be the sole choice of memory for Intel's Pentium 4. RDRAM is a serial memory technology.
Memory Speed
SDRAM, at a speed of 66MHz up to 100MHz, and then 133MHz.
DDR comes in P-4 Systems.
Cache :
Cache Memory is fast memory that serves as a buffer between the processor and main memory. The memory structure of PCs is often thought of as just main memory, but it's really a five or six level structure:
The first two levels of memory are contained in the processor itself, consisting of the processor's small internal memory, or registers, and L1 cache, which is the first level of cache, usually contained in the processor.
The third level of memory is the L2 cache, usually contained on the motherboard. The Celeron chip from Intel actually contains 128K of L2 cache within the form factor of the chip.
The fourth level, is being referred to as L3 cache. This cache used to be the L2 cache on the motherboard, but now that some processors include L1 and L2 cache on the chip, it becomes L3 cache. Usually, it runs slower than the processor, but faster than main memory.
The fifth level (or fourth if you have no "L3 cache") of memory is the main memory itself.
The sixth level is a piece of the hard disk used by the Operating System, usually called virtual memory. Most operating systems use this when they run out of main memory, but some use it in other ways as well.
Older memory types
DRAM about 50 MHz.
EDO DRAM about 50 MHz.
P-III systems used to 3.3 volt, 168-pin SDRAM DIMMs. SDRAM started out running at 66 MHz. SDRAM is able to scale to 133 MHz (PC133) up to 180MHz or higher.
DDR (Double Data Rate SDRAM)
DDR basically doubles the rate of data transfer of standard SDRAM by transferring data on the up and down tick of a clock cycle. DDR memory operating at 333MHz actually operates at 166MHz * 2 or 133MHz*2. DDR is a 2.5 volt technology that uses 184 pins in its DIMMs..
Rambus DRAM (RDRAM)
Intel has given RDRAM it's for the consumer market, and it will be the sole choice of memory for Intel's Pentium 4. RDRAM is a serial memory technology.
Memory Speed
SDRAM, at a speed of 66MHz up to 100MHz, and then 133MHz.
DDR comes in P-4 Systems.
Cache :
Cache Memory is fast memory that serves as a buffer between the processor and main memory. The memory structure of PCs is often thought of as just main memory, but it's really a five or six level structure:
The first two levels of memory are contained in the processor itself, consisting of the processor's small internal memory, or registers, and L1 cache, which is the first level of cache, usually contained in the processor.
The third level of memory is the L2 cache, usually contained on the motherboard. The Celeron chip from Intel actually contains 128K of L2 cache within the form factor of the chip.
The fourth level, is being referred to as L3 cache. This cache used to be the L2 cache on the motherboard, but now that some processors include L1 and L2 cache on the chip, it becomes L3 cache. Usually, it runs slower than the processor, but faster than main memory.
The fifth level (or fourth if you have no "L3 cache") of memory is the main memory itself.
The sixth level is a piece of the hard disk used by the Operating System, usually called virtual memory. Most operating systems use this when they run out of main memory, but some use it in other ways as well.
Older memory types
DRAM about 50 MHz.
EDO DRAM about 50 MHz.
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