Overclocking Patriot PDC1G5600ELK
As we said in the previous section, the reviewed Patriot PDC1G5600ELK modules combine an extremely high frequency with very bad timings. As a result, their operation in the default mode may not be so profitable from the overall system performance standpoint. On the other hand, this memory is based on Samsung TCCD chips which can be characterized as universal. Besides supporting high frequencies, they do very well at frequencies about 400-500MHz with aggressive timings. Viewed from this perspective, the modules may prove a good product if you do not focus on frequency alone.
To see how Patriot PDC1G5600ELK memory behaves at different timings, we assembled a testbed out of the following hardware parts:
- AMD Athlon 64 FX-57 CPU (Socket 939, 2.8GHz, 1024KB L2 cache, San Diego core)
- DFI NF4 Ultra-D mainboard (Socket 939, NVIDIA nForce4 Ultra chipset)
- PowerColor RADEON X800 XT graphics card (PCI-Express x16)
- Maxtor MaXLine III 250GB hard disk drive (Serial ATA-150)
- Microsoft Windows XP with Service Pack 2
The goal of this test was to find the highest frequencies the Patriot PDC1G5600ELK modules would be capable of working at with different timings. The stability of the system was questioned by running Memtest86+ version 1.60 and then S&M 1.7.3 (in Windows XP). This two-tier approach ensures the highest credibility of the results.
We tested our Patriot PDC1G5600ELK modules at the default voltage of these chips, i.e. 2.9V. It is in fact useless to increase the DIMM voltage any higher for modules based on Samsung TCCD chips – this doesn’t improve their overclockability.
Against the specification, we set the Command Rate parameter at 1T as overclockers will likely to prefer this value.
As you can see, the results are quite typical for TCCD-based memory modules. The Patriot PDC1G5600ELK could work at 446MHz with aggressive 2-2-2-10 timings and at 500MHz with 2-3-3-10 timings. When we slackened the timings to 3-4-4-12, the product of Patriot Memory reached 588MHz frequency.
Advanced memory modules from other manufacturers, based on the same chips, can boast more impressive results in terms of operational frequencies. For example, the OCZ EL DDR PC-4800 Dual Channel Platinum modules of DDR600 SDRAM can work at frequencies up to 640MHz with 3-4-4-12 timings (for details see our article called DDR600 SDRAM Tested: OCZ EL DDR PC-4800 Dual Channel Platinum Review ). The Patriot PDC1G5600ELK memory, however, behaved typically well for modules based on Samsung TCCD chips at the aggressive timings. Higher frequencies with aggressive timings are supported by modules on Winbond UTT chips, for example by OCZ EL DDR PC3500 Gold GX.