Foxconn C51XEM2AA- 8EKRS2H AM2 Top-Dog - Overclocking - Memory and System Performance

Article Index
Foxconn C51XEM2AA- 8EKRS2H AM2 Top-Dog
Board Layout and Close Up Pics
Installation and BIOS Screenshots
Overclocking - Memory and System Performance
System Performance - Continued...
Gaming Performance and Conclusion

Overclocking:

For those who are just starting out overclocking or would like to learn more about the 590 SLI chipset, nVidia has published a 590 SLI overclocking guide that features this exact same board.  You can view and download the PDF guide here.  The guide published by nVidia recommends initial setup in the BIOS and additional tweaking with nTune in windows.  While the nTune utility does work, by personal preference I chose to perform all of my adjustments from the BIOS itself.  Maximum CPU speed achieved was 2.8 GHz @ 1.4 volts.  Maximum FSB achieved was 300 FSB.  Maximum memory speed achieved was 1120 MHz.   The best mix was a CPU multiplier of 10x, FSB of 280, and RAM divider of DDR800.  This gave an overall overclock of 2.8 Ghz with 1120 MHz memory speed.

During the trial and error phases of overclocking to find the fastest speeds, I found the C51X to be a dream if I re-booted with an incompatible combination.  After re-booting if there was a POST error, simply wait and the system will continue to re-boot itself back to stock speeds and allow you to make your next adjustment.  I did not have to clear the CMOS once after discovering this feature.  If SLI is detected in the BIOS, LinkBoost is enabled and automatically overclocks the PCIe bus for each of the 16X PCIe slots from 100 MHz to 125 MHz.

The Windsor X2 4800+ tops out at about 2.8 GHz and multipliers below 10x do not calculate with memory dividers properly, so 280 FSB gave us our best all around performance.  OC’d the temperatures were handled easily by our Reserator II.  Under full load both cores reached 52°C.  Throughout testing, benchmarking, and stability testing, (running two instances of Folding @ Home for 24 hrs) I did not have a single stability issue with this board either at stock speeds or overclocked.

Memory:

Crucial provided us with some smoking PC2-8000 EPP SLI Ready memory that has proven to be an excellent overclocker with this Foxconn C51X board.  At stock speeds at 800 MHz these modules run at 4-4-4-12-1T at “Auto” voltage.  Overclocked to 1120 MHz these modules run at 5-5-5-15-2T at 2.225 volts.  An 11% overclock on PC2-8000 memory modules is quite an achievement.

Crucial PC2-8000
Crucial PC2-8000

System Performance:

To benchmark this system combination we used a mix of synthetic and real world applications, real world games, and 3DMark ‘06.  Benchmarks were performed at stock speeds, then again overclocked.

 


Memory Bandwidth:

Memory was tested for bandwidth with Everest memory read test.

CPU-Z Memory
CPU-Z Memory

Everest Stock
 Everest Stock

Everest Overclocked
 Everest Overclocked