Below is the short report.Based on 8,318 user benchmarks for the Intel Core2 Duo P8400 and the Core2 Duo T8300, we rank them both on effective speed and value for money against the best 1,316 CPUs.Intel Core 2 Duo T8300 Benchmarks. I successfully overclock / overvolt/ undervolt my Lenovo T61 without soldering/cracking motherboard. AMD CPUs typically in this chart include AMD Mobile CPUs, AMD Turion IIs, AMD Opteron Dual Core CPUs. Intel CPUs in this chart include the slower Intel Core2 Duo CPUs, Intel Xeon CPUs and Intel Celeron CPUs. This chart comparing mid range CPUs is made using thousands of PerformanceTest benchmark results and is updated daily.
Intel Core2 Duo T8300 2.40GHz.Problem: Intel chipset lock the CPU at lowest multiplier (6x) if it is forced to work at frequency higher than designed. PassMark - CPU Benchmarks - List of Benchmarked CPUs. Geekbench 5 scores are calibrated against a baseline score of 1000 (which is the score of an Intel Core i3-8100).Add your CPU to our benchmark chart with PerformanceTest V8. The data on this chart is gathered from user-submitted Geekbench 5 results from the Geekbench Browser.
T8300 Passmark Mod Between R1025
Later, if the overclock is successful, you can (permanently) solder B1A mod between R1025 resistor and near by big capacitor.On Picture 8 the B2 pinmod was made to pull-down BSEL1 pin of the Clock generator to the Ground (there is a line connected the hole on Pic. Connection was made by ATA-66 cable to the two holes on the motherboard (in order to keep warranty). For overclocking FSB from 200Mhz to 266Mhz, we need to mod BSEL1 (see Picture 4).Practice: On Picture 3 the B1 pinmod was made to pull-up BSEL1 pin of the Chipset to VCC1R05. Therefore, we can cheat the chipset by putting different voltages to it’s BSEL and clock generator BSEL pins.Solution: Pull-up BSEL pin of the Chipset to VCC line and pull-down BSEL pin of the Clock generator to ground. Fortunately, for Lenovo T61 there are three 1K resistor between BSEL pins of the chipset and BSEL pins of the clock generator (Resistors 1024-1026 on Picture 4). For IBM / Lenovo laptops, the BIOS also prevents the computer to boot up.Research: The chipset determines working frequency using BSEL pins (CFG0-CFG2 on Picture 4 for 965 chipset).
T8300 Passmark Windows 7 My Overclocked
However, in my observation, this not fully disables Speed step, because in Windows 7 my overclocked T9300 (at 3.2Ghz) falled in Prime Blend Test after 10-15 min during transition between test modes, for example between 1024K and 8K, while it is rock stable in Prime Small FFT test (harder for CPU/FPU). Following advice of one Chinese guy on 51nb forum, I disabled Speed Step in BIOS (Config -> Power Option -> Intel Enhanced Speed Step -> Disable). To make overclock stable, you need to disable IDA. 14x/3.724Ghz 266Mhz FSB for T9500 CPU. When IDA is activated, the Penryn CPU gets very high multiplier /frequency, e.g. For switchable overclock, you can make a switch here (I keep the switch in the unused modem jack).Extra: The IDA problem.
So see the rest of pictures in the next post.^ what a wonderful work from Binh. At lowest multiplier (1.6Ghz), it works at 0.775v!The forum allows only 6 attachment. So I replaced it by a T8300, and it is fully stable at 1.20v.Lenovo T61 frankenpad in T60p UXGA IPS chasis, undervolted by VID4 to VSS mod and overvolted by 8% by feedback circuit mod. Temperature in Prime Small FFT is about 82-85 deg (ambient temperature 18 deg Celsius).However, as it was described above, the T9300 is not very stable with Prime Blend Test (due to IDA ?), so I have to make VID2 to VSS mod to force it to run at 1.375v (with 8% overvolt) in IDA mode and 1.27v at 3.2Ghz (because after mod, the voltages between 1.20 and 1.27v are not available).
Taking off the keyboard produces the same effect, but I'm guessing that would not be permanent solution, hehe.I'm using a Studio XPS 1645 laptop, which has also SLG8SP585V as PLL like XPS 1647 and Acer Aspire 5740G, its chipset is PM55 (Intel(R) 5 Series/3400 Series Chipset Family SMBus Controller - 3B30), Super IO chip is IT8512E per RW.I tried to change BCLK with latest version of SetPLL and LUT files provided by courtesy of MotoVlad for SLG8SP585 of his Aspire 5740G (2 versions: with or without Pinmod found in his post in acerfans.ru), but it didn't work on my PC.Here are some error messages I got when trying to use SetPLL and RWSetpll slg8sp585 135 -> "Failed to set BCLK"Click on "Clock Generator" in RW -> "SMBus return error, clock generator may stop response"Click on "SMBus Device" in RW -> Nothing appears in new window.In SetFSB Diagnosis Tab, I got nothing on "PLL Control Registers", and here is what displays in "SMBus I/O Registers" and "Chipset information":SMBus I/O Registers -Base Address 1840h-00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F00 44 00 14 00 D3 08 00 00 00 44 00 00 14 00 07 07Chipset Information -Host Bridge Device/Vendor D1328086h-What information should I have (motherboard version, proper SMBus setting, etc. Laptop would not look stock anymore of course.
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