You'll see from the chart below that the Mushkin PC2-5300 memory was able to maintain its relatively tight timings of 3-3-3-10 up to DDR 700 speeds with no problems. Far Cry was set for ultra quality in the settings with a resolution of 1024 x 768.
The Half Life 2 - Lost Coast benchmark was run at a 1024 x 768 resolution at maximum quality settings with HDR enabled. SiSoft Sandra Professional Buffered and Unbuffered memory scoring were both included in benchmarking, along with Super PI mod 1.4 time to calculate 2 million places in seconds. The chart below indicates relative scaling with front side bus speed increases for comparative purposes. DDR2 Memory on the Intel platform, however, is Double Data Rate by definition, so a 266 base setting is 533 (2x266). Keep in mind that the Intel FSB is quad-pumped, which is why a setting of 266 yields a FSB of 1066 (4x266). Since the Presler 955 Extreme Edition processor utilizes a 1066 MHz bus speed, it allows us to use the 1:1 memory to FSB clock ratio when the front side bus speed is set to 266 megahertz. The CPU clocks also work on a multiple of the front side bus clock speeds. You can overclock an Intel system by just raising the front side bus speeds while you lower the memory ratio. The DDR2 race for timings and speed will pick up pace with the introduction of the AMD AM2 socket and Intel Conroe later this year. Now that DDR2 memory is maturing, manufacturers are finally addressing the increasing market for faster DDR2 at tighter memory timings. Proceeding from the base rate of 200 MHz (which translates to FSB800 for DDR2-400), this allows DDR2-400, DDR2-533, DDR2-667 and DDR2-800 settings. Most modern chipset vendors now offer a wide range of memory ratios among the BIOS settings, so there are many choices for stock memory speed and base speed for overclocking.Īs mentioned before, both the Intel NB 945 and 955x chipsets offer four distinct clocking ratios: 1:1, 3:4, 3:5 and 2:1.
With an Intel chipset, the main memory always runs at a specified ratio, which is in relation to the clock rate for the system itself (AKA the FSB). We were able to overclock using the DDR2-400, DDR2-533, DDR2-667 or DDR2-800 memory straps, although using the DDR2-800 memory strap did require looser timings.
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