FSB Speed Limit Problem?

proset · Dec 15, 2010

Gigabyte GA-EP453T-UD3L
E8600
4 GB ADATA SDRAM DDR3 2000G (PC3 16000)
Water Cooling.

I had the E8600 "sitting around" (from a previous project) and just purchased a GA-EP453T-UD3L MB and ADATA memory to see what to see what IOC I could achieve.

Have hit a wall with my FSB.

418 MHz x 10 (4.18 GHz) rock solid with stock CPU voltage, 1:2 Memory multiplier Maximum temp Prime 95, 42 C.

419 MHz x 10 won't boot.

Have tried raising CPU voltage (up to 1.4V), no change

Have tried other multipliers, (6X, 7X...) multiplied with 419 MHz , no boot.

Memory multiplier has no effect (lowest).

Do I have a bad MB or is it something else limiting my FSB?

Any help appreciated.

redduc900 · Dec 15, 2010

proset said:
Gigabyte GA-EP453T-UD3L

I assume you meant GA-EP43T-UD3L? If that's the case, then you've probably hit a FSB wall at 418MHz. The P43 E chipset on average maxes out at 418-420MHz, w/ some rare instances of up to ~430Mhz. You might want to post all of your current voltages at 418MHz, including the DRAM frequency, rated timings and voltage...

Code:

Load-Line Calibration.................: [Enabled]
CPU Vcore..............x.xxxxxV.......: [Auto]
CPU Termination........1.200V.........: [Auto]
CPU PLL................1.500V.........: [Auto]
CPU Reference..........0.760V.........: [Auto]
*** MCH/ICH ***************************
MCH Core...............1.100V.........: [Auto]
MCH Reference..........0.760V.........: [Auto]
MCH/DRAM Reference.....0.900V.........: [Auto]
ICH I/O................1.500V.........: [Auto]
ICH Core...............1.100V.........: [Auto]
*** DRAM ******************************
DRAM Voltage...........1.800V.........: [Auto]
DRAM Termination.......0.900V.........: [Auto]
Channel A Reference....0.900V.........: [Auto]
Channel B Reference....0.900V.........: [Auto]

proset · Dec 15, 2010

redduc900 thank you for your help.

My voltage settings:

Load-Line Calibration..: [Disabled]
CPU Vcore..............1.25000V
CPU Termination........1.40000V
CPU PLL................1.75000V
CPU Reference..........0.80500V
*** MCH/ICH *******************
MCH Core...............1.200V
MCH Reference..........0.760V
MCH/DRAM Reference.....0.900V
ICH I/O................1.680V
ICH Core...............1.100V
*** DRAM **********************
DRAM Voltage...........1.800V
DRAM Termination.......0.7500V

DRAM Timing: 8-8-8-20

CPU: 4180.00 MHz
FSB: 418 MHz
Ratio: 10
Memory: 1672 MHz
PCI-E 100 MHz
PCI 33 MHz

MattNo5ss · Dec 15, 2010

to OCForums!

Have you tried using a higher NB strap and/or higher NB voltage?

redduc900 · Dec 15, 2010

Like Matt suggested, try the D strap ((G)MCH Frequency Latch) w/ the 3.33 DRAM multiplier (System Memory Multiplier (SPD)) = DDR3-1392MHz w/ tighter timings. Also lower the CPU PLL from 1.75 to 1.55V, increase MCH Core voltage from 1.2 to ~1.3-1.35V, and increase ICH Core voltage from 1.10 to 1.20V.

proset · Dec 15, 2010

Thank you all

First let me thank those who have responded with suggestions and comments.

I've tried all the suggestions without success (still can't get by 418 MHz FSB).

I've also search the Internet and found many posts regarding/detailing this problem (hitting the wall at less than 420 MHz) with the P43 Northbridge chipset. And I did not find any solutions to this problem.

As an aside my reason for purchasing this board was that it seemed to be the best one (all alternative used P43) that newegg offered that would accommodate the 775 socket and DDR3. What I'm somewhat surprised that is that I would've expected a board set up for DDR 3 to have better FSB capabilities.

Thank you again for all those who offered their help and support.

FSB Speed Limit Problem?

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