Dynamic Random-Access Memory (DRAM) Bit Rate
| Module Type | Chip Type | Internal Clock [a] | Bus Clock | Bus Speed [b] | Transfer Rate | Transfer Rate |
| FPM DRAM | 70 ns tRAC | 22 MHz | 22 MHz | 0.0177 GT/s | 1.416 Gbit/s | 177 MB/s |
| EDO DRAM (486 CPU) | 60 ns tRAC | 33 MHz | 33 MHz | 0.0266 GT/s | 2.128 Gbit/s | 266 MB/s |
| EDO DRAM (Pentium CPU) | 60 ns tRAC | 66 MHz | 66 MHz | 0.066 GT/s | 4.264 Gbit/s | 533 MB/s |
| PC-66 SDR SDRAM | 10/15 ns | 66 MHz | 66 MHz | 0.066 GT/s | 4.264 Gbit/s | 533 MB/s |
| PC-100 SDR SDRAM | 8 ns | 100 MHz | 100 MHz | 0.100 GT/s | 6.4 Gbit/s | 800 MB/s |
| PC-133 SDR SDRAM | 7/7.5 ns | 133 MHz | 133 MHz | 0.133 GT/s | 8.528 Gbit/s | 1.066 GB/s |
| RIMM-1200 RDRAM | PC600 | 75 MHz | 300 MHz | 0.600 GT/s | 9.6 Gbit/s | 1.2 GB/s |
| RIMM-1400 RDRAM | PC700 | 87.5 MHz | 350 MHz | 0.700 GT/s | 11.2 Gbit/s | 1.4 GB/s |
| RIMM-1600 RDRAM | PC800 | 100 MHz | 400 MHz | 0.800 GT/s | 12.8 Gbit/s | 1.6 GB/s |
| PC-1600 DDR SDRAM | DDR-200 | 100 MHz | 100 MHz | 0.200 GT/s | 12.8 Gbit/s | 1.6 GB/s |
| RIMM-2100 RDRAM | PC1066 | 133 MHz | 533 MHz | 1.066 GT/s | 17.034 Gbit/s | 2.133 GB/s |
| PC-2100 DDR SDRAM | DDR-266 | 133 MHz | 133 MHz | 0.266 GT/s | 17.034 Gbit/s | 2.133 GB/s |
| RIMM-2400 RDRAM | PC1200 | 150 MHz | 600 MHz | 1.2 GT/s | 19.2 Gbit/s | 2.4 GB/s |
| PC-2700 DDR SDRAM | DDR-333 | 166 MHz | 166 MHz | 0.333 GT/s | 21.336 Gbit/s | 2.667 GB/s |
| PC-3200 DDR SDRAM | DDR-400 | 200 MHz | 200 MHz | 0.400 GT/s | 25.6 Gbit/s | 3.2 GB/s |
| PC2-3200 DDR2 SDRAM | DDR2-400 | 100 MHz | 200 MHz | 0.400 GT/s | 25.6 Gbit/s | 3.2 GB/s |
| PC-3500 DDR SDRAM | DDR-433 | 216 MHz | 216 MHz | 0.433 GT/s | 27.728 Gbit/s | 3.466 GB/s |
| PC-3700 DDR SDRAM | DDR-466 | 233 MHz | 233 MHz | 0.466 GT/s | 29.864 Gbit/s | 3.733 GB/s |
| PC-4000 DDR SDRAM | DDR-500 | 250 MHz | 250 MHz | 0.500 GT/s | 32 Gbit/s | 4 GB/s |
| PC-4200 DDR SDRAM | DDR-533 | 266 MHz | 266 MHz | 0.533 GT/s | 34.128 Gbit/s | 4.266 GB/s |
| PC2-4200 DDR2 SDRAM | DDR2-533 | 133 MHz | 266 MHz | 0.533 GT/s | 34.128 Gbit/s | 4.266 GB/s |
| PC-4400 DDR SDRAM | DDR-550 | 275 MHz | 275 MHz | 0.550 GT/s | 35.2 Gbit/s | 4.4 GB/s |
| PC-4800 DDR SDRAM | DDR-600 | 300 MHz | 300 MHz | 0.600 GT/s | 38.4 Gbit/s | 4.8 GB/s |
| PC2-5300 DDR2 SDRAM | DDR2-667 | 166 MHz | 333 MHz | 0.667 GT/s | 42.664 Gbit/s | 5.333 GB/s |
| PC2-6000 DDR2 SDRAM | DDR2-750 | 188 MHz | 375 MHz | 0.750 GT/s | 48 Gbit/s | 6 GB/s |
| PC2-6400 DDR2 SDRAM | DDR2-800 | 200 MHz | 400 MHz | 0.800 GT/s | 51.2 Gbit/s | 6.4 GB/s |
| PC3-6400 DDR3 SDRAM | DDR3-800 | 100 MHz | 400 MHz | 0.800 GT/s | 51.2 Gbit/s | 6.4 GB/s |
| PC2-7200 DDR2 SDRAM | DDR2-900 | 225 MHz | 450 MHz | 0.900 GT/s | 57.6 Gbit/s | 7.2 GB/s |
| PC2-8000 DDR2 SDRAM | DDR2-1000 | 250 MHz | 500 MHz | 1 GT/s | 64 Gbit/s | 8 GB/s |
| PC2-8500 DDR2 SDRAM | DDR2-1066 | 266 MHz | 533 MHz | 1.066 GT/s | 68 Gbit/s | 8.5 GB/s |
| PC3-8500 DDR3 SDRAM | DDR3-1066 | 133 MHz | 533 MHz | 1.066 GT/s | 68 Gbit/s | 8.5 GB/s |
| PC2-8800 DDR2 SDRAM | DDR2-1100 | 275 MHz | 550 MHz | 1.1 GT/s | 70.4 Gbit/s | 8.8 GB/s |
| PC2-9200 DDR2 SDRAM | DDR2-1150 | 288 MHz | 575 MHz | 1.15 GT/s | 73.6 Gbit/s | 9.2 GB/s |
| PC2-9600 DDR2 SDRAM | DDR2-1200 | 300 MHz | 600 MHz | 1.2 GT/s | 76.8 Gbit/s | 9.6 GB/s |
| PC2-10000 DDR2 SDRAM | DDR2-1250 | 312 MHz | 625 MHz | 1.25 GT/s | 80 Gbit/s | 10 GB/s |
| PC3-10600 DDR3 SDRAM | DDR3-1333 | 167 MHz | 667 MHz | 1.333 GT/s | 85.336 Gbit/s | 10.667 GB/s |
| PC3-11000 DDR3 SDRAM | DDR3-1375 | 172 MHz | 688 MHz | 1.375 GT/s | 88 Gbit/s | 11 GB/s |
| PC3-12800 DDR3 SDRAM | DDR3-1600 | 200 MHz | 800 MHz | 1.6 GT/s | 102.4 Gbit/s | 12.8 GB/s |
| PC3-13000 DDR3 SDRAM | DDR3-1625 | 203 MHz | 813 MHz | 1.625 GT/s | 104 Gbit/s | 13 GB/s |
| PC3-14400 DDR3 SDRAM | DDR3-1800 | 225 MHz | 900 MHz | 1.8 GT/s | 115.2 Gbit/s | 14.4 GB/s |
| PC3-14900 DDR3 SDRAM | DDR3-1866 | 233 MHz | 933 MHz | 1.866 GT/s | 119.464 Gbit/s | 14.933 GB/s |
| PC3-16000 DDR3 SDRAM | DDR3-2000 | 250 MHz | 1000 MHz | 2 GT/s | 128 Gbit/s | 16 GB/s |
| PC3-17000 DDR3 SDRAM | DDR3-2133 | 267 MHz | 1067 MHz | 2.133 GT/s | 136.528 Gbit/s | 17.066 GB/s |
| PC4-17000 DDR4 SDRAM | DDR4-2133 | 267 MHz | 1067 MHz | 2.133 GT/s | 136.5 Gbit/s | 17 GB/s |
| PC3-17600 DDR3 SDRAM | DDR3-2200 | 275 MHz | 1100 MHz | 2.2 GT/s | 140.8 Gbit/s | 17.6 GB/s |
| PC3-19200 DDR3 SDRAM | DDR3-2400 | 300 MHz | 1200 MHz | 2.4 GT/s | 153.6 Gbit/s | 19.2 GB/s |
| PC4-19200 DDR4 SDRAM | DDR4-2400 | 300 MHz | 1200 MHz | 2.4 GT/s | 153.6 Gbit/s | 19.2 GB/s |
| PC3-21300 DDR3 SDRAM | DDR3-2666 | 333 MHz | 1333 MHz | 2.666 GT/s | 170.5 Gbit/s | 21.3 GB/s |
| PC4-21300 DDR4 SDRAM | DDR4-2666 | 333 MHz | 1333 MHz | 2.666 GT/s | 170.5 Gbit/s | 21.3 GB/s |
| PC3-24000 DDR3 SDRAM | DDR3-3000 | 375 MHz | 1500 MHz | 3.0 GT/s | 192 Gbit/s | 24 GB/s |
| PC4-24000 DDR4 SDRAM | DDR4-3000 | 375 MHz | 1500 MHz | 3.0 GT/s | 192 Gbit/s | 24 GB/s |
| PC4-25600 DDR4 SDRAM | DDR4-3200 | 400 MHz | 1600 MHz | 3.2 GT/s | 204.8 Gbit/s | 25.6 GB/s |
| PC5-41600 DDR5 SDRAM | DDR5-5200 | 650 MHz | 2600 MHz | 5.2 GT/s | 332.8 Gbit/s | 41.6 GB/s |
| PC5-44800 DDR5 SDRAM | DDR5-5600 | 700 MHz | 2800 MHz | 5.6 GT/s | 358.4 Gbit/s | 44.8 GB/s |
| PC5-51200 DDR5 SDRAM | DDR5-6400 | 800 MHz | 3200 MHz | 6.4 GT/s | 409.6 Gbit/s | 51.2 GB/s |
[a] The clock rate at which DRAM memory cells operate. Memory latency is largely determined by this rate. Note that until the introduction of DDR4 the internal clock rate saw relatively slow progress. DDR/DDR2/DDR3 memory uses 2n/4n/8n (respectively) prefetch buffer to provide higher throughput, while the internal memory speed remains similar to that of the previous generation.
[b] The “memory speed/clock” advertised by manufacturers and suppliers usually refers to this rate (with 1 GT/s = 1 GHz). Note that modern types of memory use a DDR bus with two transfers per clock.