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Performance
First of all, we suggest taking a look at the Athlon XP performance with the memory, as soon as the new 400MHz bus support has been implemented. We will use Cachemem utility:
| Athlon XP 3000+ | Athlon XP 3000+ | Athlon XP 3200+ | Pentium 4 3.06 | Pentium 4 3.0 |
Dual Channel DDR333 SDRAM | Dual Channel DDR400 SDRAM | Dual Channel DDR333 SDRAM | Dual Channel DDR400 SDRAM | ||
Memory read speed | 1657.4 | 1919.6 | 1956.5 | 2794.1 | 3422.1 |
Memory write speed | 1005.2 | 1215.6 | 1209.8 | 955.6 | 1114.1 |
Memory copy speed | 1231.2 | 1443.6 | 1443.3 | 1794.2 | 2268.8 |
Latency, CPU cycles | 210 | 170 | 188 | 302 | 248 |
Latency, ns | 96 | 81 | 85 | 98 | 83 |
When Athlon XP moves to 400MHz processor bus, its bandwidth will get 18.5% higher: up to 3.2GB/sec. The bandwidth of the dual-channel memory subsystem used in nForce2 will grow up to 6.4GB/sec. This is exactly why the actual performance with the memory gets better: the read speed grows by 18%, the write speed – by 20%, and the copy speed – by 17%. Unfortunately, this performance growth is not enough to catch up with the Pentium 4 memory subsystems, which bus bandwidth equals 4.2GB/sec or 6.4GB/sec.
As for the memory subsystem latencies, a slight advantage here belongs to Athlon XP with 400MHz processor bus. Note that Athlon XP system owes this pretty low latency in case of DDR400 SDRAM to high-quality Corsair memory modules.
Now let’s check the results obtained in other memory subsystem tests.
The results here illustrate very accurately the theoretical bandwidth of the bus between the CPU and the memory. Pentium 4 processor family is ahead of all, as they boast Quad Pumped Bus and a faster bus between the CPU and the chipset.
We observe a similar picture in the synthetic PCMark2002 test.
