- Joined
- Aug 5, 2002
- Location
- Brisbane, Australia
Decided to see how well tight 3-3-3-8 timings compare to high clocked 4-4-4-8 timings. Only difference is 4-4-4-8 timings were done on 2GB Gskill PC6400PHU2 HZ Micron D9GMH 0629 batch @500mhz 4-4-4-8 and tight 3-3-3-8 timings were done with 2GB OCZ PC2-8000 Titanium Alpha VX2 Micron D9GKX @417mhz 3-3-3-8 at 2.39v
System:
vs
Intel Core 2 Quad Q6600 Kentsfield quad core cpu was clocked on both tests at 9x333FSB = 3001Mhz.
2:3 divider 500Mhz 4-4-4-8 vs 4:5 divider 417mhz 3-3-3-8
vs
500mhz 4-4-4-8 (left) vs 417mhz 3-3-3-8 (right)
1M
16.907s vs 16.812s
2M
40.750s vs 40.750s
4M
1m 34.454s vs 1m 34.000s
8M
3m 31.156s vs 3m 31.157s
16M
7m 44.281s vs 7m 44.141s
32M
16m 48.438s vs 16m 47.562s
Amazing that 417mhz 3-3-3-8 timings not only kept up with but also beat 500mhz 4-4-4-8 timings in 4 out of 6 of the Super Pi times. Especially in 32M Pi test! I suspect it's the tighter timings but also due to tighter default tRD value. According to memset v3.0, 417mhz 3-3-3-8 had by default tRD = 5 whereas 500mhz 4-4-4-8 had tRD = 7 by default.
Probably explains why PC6400 rated DDR2 memory in 3-3-3-8 default timings usually cost as much if not more than PC8000 rated memory due to it's performance as well as the time and cost it takes for the hand testing and binning process!
System:
- Intel Core 2 Quad Q6600 Kentsfield QUPT B3 Step 7
- Corsair Hydrocool 200EX
- Intel D975XBX Badaxe rev304 1441 bios
- 128MB Gainward FX5200 PCI card
- 3x320GB Seagate 7200.10 SATAII Matrix Raid 0
- 1x74GB Western Digital Raptor 8MB
- Pioneer DVD-RW
- FDD
- 1KW PCP&C SLI PSU
vs
Intel Core 2 Quad Q6600 Kentsfield quad core cpu was clocked on both tests at 9x333FSB = 3001Mhz.
2:3 divider 500Mhz 4-4-4-8 vs 4:5 divider 417mhz 3-3-3-8
vs
Results
500mhz 4-4-4-8 (left) vs 417mhz 3-3-3-8 (right)
1M
16.907s vs 16.812s
2M
40.750s vs 40.750s
4M
1m 34.454s vs 1m 34.000s
8M
3m 31.156s vs 3m 31.157s
16M
7m 44.281s vs 7m 44.141s
32M
16m 48.438s vs 16m 47.562s
Amazing that 417mhz 3-3-3-8 timings not only kept up with but also beat 500mhz 4-4-4-8 timings in 4 out of 6 of the Super Pi times. Especially in 32M Pi test! I suspect it's the tighter timings but also due to tighter default tRD value. According to memset v3.0, 417mhz 3-3-3-8 had by default tRD = 5 whereas 500mhz 4-4-4-8 had tRD = 7 by default.
Probably explains why PC6400 rated DDR2 memory in 3-3-3-8 default timings usually cost as much if not more than PC8000 rated memory due to it's performance as well as the time and cost it takes for the hand testing and binning process!