FSB Overclocking Results

Front Side Bus Overclocking Testbed
Processor: Pentium 4 Smithfield LGA 775
840EE Dual Core 3.2GHz
CPU Voltage: 1.4825V (1.4000V default)
Memory Settings: 3-2-2-8 at 667MHz
Memory Voltage: 2.1V
SPP Voltage: 1.58V
FSB Voltage: 1.40V
Cooling: Thermaltake Big Typhoon
Power Supply: OCZ Power Stream 520
Maximum CPU OverClock: 250fsb x 17 (4250MHz) +33%
Maximum FSB OverClock: 255fsb x 16 (4092MHz) +27%

This board is an average overclocker when comparing it to the Intel 975X boards. At these overclock settings, the system was able to complete all of our benchmark test suites three consecutive times and run Prime95 and SuperPI without issue. We lowered the CPU multiplier to 14, but could not overclock past a 252FSB setting. We changed the LDT ratio to several different settings without success. These results continue the pattern in which we see with the nForce4 Intel Edition chipsets not reaching high FSB speeds, but being successful in overclocking the CPU at standard FSB settings.

We installed our 955EE CPU and were able to reach the highest CPU overclock recorded for our sample unit. The board performed flawlessly at this setting and reaching 4.55GHz on air with this chip is impressive. However, all attempts at lowering the multiplier and extending the bus speed past 1180MHz resulted in failure.

Updated 955EE Testing

We flashed the board to the latest bios, NFUIA210.BST, installed our 955EE CPU, and were able to reach a very stable 4.62GHz with air cooling. Our previous attempts at this multiplier resulted in a stable 4.50GHz at a bus speed of 1060MHz. We were able to boot the machine at 4.76GHz but could not complete our benchmark testing.

Memory Stress Testing

Memory stress tests look at the ability of the Biostar TForce4 U 775to operate at the officially supported memory frequencies of 667MHz DDR2, at the best performing memory timings that the Corsair CM2X512A-5400UL revision 1.3 will support.

Biostar TForce4 U 775
Stable DDR667 Timings - 2 DIMMs
(2/4 slots populated - 1 Dual-Channel Bank)
Clock Speed: 200MHz (800FSB)
Timing Mode: 667MHz - Default
CAS Latency: 3
RAS to CAS Delay: 2
RAS Precharge: 2
RAS Cycle Time: 8
Command Rate: 1T
Voltage: 2.1V

The Biostar TForce4 was very stable with 2 DDR2 modules in Dual-Channel at the settings of 3-2-2-8 at 2.1V. We will now install all four available memory slots that result in more strenuous requirements on the memory subsystem than testing 2 DDR2 modules on a motherboard.

Biostar TForce4 U 775
Stable DDR667 Timings - 4 DIMMs
(4/4 slots populated - 2 Dual-Channel Banks)
Clock Speed: 200MHz (800FSB)
Timing Mode: 667MHz - Default
CAS Latency: 3
RAS to CAS Delay: 3
RAS Precharge: 3
RAS Cycle Time: 8
Command Rate: 2T
Voltage: 2.10V

The Biostar TForce4 was completely stable with 4 DDR2 modules in Dual-Channel operation at the settings of 3-3-3-8, but required the command rate to be increased to 2T. We tried several combinations of memory settings at the 3-2-2-8 settings, but the board was not stable enough to complete our test suite.

Biostar Tforce4 U 775: Features Test Setup
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  • jamesbond007 - Thursday, February 16, 2006 - link

    Haha! Way to go, Gary. You have a fan base! =P
  • Gary Key - Thursday, February 16, 2006 - link

    Thanks for kind words everyone. I will post a short update to this article in a couple of days as the new bios results are looking promising in resolving some overclock and bios lockup issues.
  • drewintheav - Thursday, February 16, 2006 - link

    Gary is awesome! :)
  • Zebo - Thursday, February 16, 2006 - link

    I love Gary can't we get him writing articles people will read? Intel/biostar - common.. you'll get 1000 page hits max and 3/4 of them are because Gary wrote it!:P
  • Googer - Thursday, February 16, 2006 - link

    Not too bad if you want a P4, but for me I am avoiding nVIDIA Chipsets except when it comes to AMD products. Go Go ULi!
  • DigitalFreak - Thursday, February 16, 2006 - link

    Uh, you mean Go Go Nvidia, since they own ULi now...
  • Googer - Thursday, February 16, 2006 - link

    Finaly Intel Gets Hypertransport on their chips, like it or not HTT probably is becoming a standard that Intel might have to adopt sooner or later.
  • DigitalFreak - Thursday, February 16, 2006 - link

    This has nothing to do with Intel. Nvidia uses HT to communicate between their north and south bridges. They've done it with all their Intel chipsets so far.
  • Googer - Thursday, February 16, 2006 - link

    Since the noth bridge has HTT, in theory you could connect an nVIDIA based nFORCE north bridge to a ULi or nVIDIA AMD north bridge and have one of several things:

    1) A dual CPU system- One Intel Pentium M/4 and One AMD 64 CPU running on the same motherboard simultaniously. The OS might need to be re-written so that multi-threaded applications only use one processor. Linux prehaps?

    2) AMD 64 Could get Quad Channel RAM higher.

    3) You could ADD a ULi M1567 Southbridge to get True AGP with that PCI-express SLI.

    4) You could possibly mix and match chipsets. VIA K8T8xx with one of AMD's north/south bridges and an nFORCE Intel Editon.

    You could possibly Connect the AMD 64 Directly (using it's own HTT link) in to the the P4 north bridge with no need to use the chipset designed for the A64.


    HTT on Intel means a whole new world of possibilites!
  • Furen - Thursday, February 16, 2006 - link

    Huh? How is Intel getting hypertransport on its chips? HT is a standard but I dont think Intel will ever adopt it because of its pride, more than anything else. It truly doesn't matter though, since HT is just a data transport and using any other data transport gives you the same results as long as it is used in a similar configuration.

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