Did a upgrade on my 2375pu T42 running XP3 with 1Gig of ram. had a 1.7 SL7EP. Got a SL7SL 2.13 Dothan Did what you do to install the CPU. Started up laptop and that all went fine. Then did some checking and a found PC Wizard and run test found that the Sl7SL was running at 598.6Mhz? The ac adapter is hooked in check the bios and is set to max performance. Checked the CPU with PC Doctor and everything passed? Any help would be great thanks...

Does your ThinkPad support 533MHz FSB? If not, you just downgraded the CPU. The 1.7GHz runs at 17 x 100. The 2.13 GHz runs at 16 x 133. If your lappie only supports 100MHz (400MHs FSB), the best it will do is 1.6GHz (16 x 100). You lost 100MHz overall, thus it was a downgrade. "If my answers frighten you then you should cease asking scary questions" - Jules Winnfield (Samuel L. Jackson) in Pulp Fiction

General Information : Real Frequency : 598.06 MHz Multiplier : 6x Low/High Multiplier : 6x / 16x Multiplier Locked : Yes Marketing Frequency : 2133.44 MHz Front Side Bus Information : Bus Speed : 99.7 MHz FSB Frequency : 398.7 MHz (QDR) Initial Frequencies : Frequency : 2133 MHz Bus Speed : 133.34 MHz (QDR) Multiplier : 16x Control Clock Frequency : Enhanced SpeedStep (EIST) : Yes - Enabled C1E - Enhanced Halt Mode : No Dynamic FSB : No Dynamic Acceleration (IDA) : No Thermal Information : Thermal Design Power : 3 W Core Power : 0.84 W (estimated) Thermal control TM1 : Yes - Enabled Thermal control TM2 : Yes - Enabled Thermal Control Circuit : Yes Digital Thermal Sensor : No Clock Modulation (ODCM) En... No Processor Performance Information : Throttle Mode AC : None Throttle Mode DC : Constant Current Configuration : None Throttle : 598 MHz Processor Power Management Information : Processor Throttling : Yes Throttle Range : 25% - 100% Active Power Scheme : High Battery Performance General Information : NorthBridge : Intel i855PM SouthBridge : 82801DBM (ICH4-M) LPC Interface Bridge NorthBridge Information : Architecture : HUB Manufacturer : Intel (IBM) Revision : A3 Bus Speed : 99.7 MHz FSB Frequency : 398.7 MHz (QDR) FSB max. Support : 400 MHz RAM max. Support : DDR (266 MHz) Memory Information : Type : DDR-SDRAM PC2700 Frequency : 166.1 MHz DRAM/FSB Ratio : 5/3 Activated Channels : Single ECC Diagnostic : YesMode CAS Latency (tCL) : 2.5 clocks RAS to CAS (tRCD) : 3 clocks RAS Precharge (tRP) : 3 clocks Cycle Time (tRAS) : 7 clocks Read Delay (tRD) : 4 clocks Is there anyway that the Multiplier could be wrong?

Dude, what is the point of all that info? Bite the bullet, admit you made a mistake & swap CPUs again. The Intel i855PM chipset only supports 400MHz FSB. The 2.13GHz Dothan is a 533MHz FSB CPU with a multiplier of 16x. It will NOT run at 2.13GHz in that laptop! At best, it will run at 1.6GHz (16 x 100)...your old CPU ran at 1.7GHz. You lost 100MHz with this "upgrade", not to mention any money you wasted on the CPU. Go back to the old 1.7GHz. http://www.intel.com/products/noteb... "If my answers frighten you then you should cease asking scary questions" - Jules Winnfield (Samuel L. Jackson) in Pulp Fiction

Ok i thought there might be something but i guess not. Oh well did not lose a lot a money will put the old CPU back in it just stinks!!! Thanks for your help...

Ehm... It seems that everything with your processor is fine. To extend the battery worktime, Intel included a SpeedStep technology into its processors. When your laptop is "idle" (e.g. no power consuming software running, like video processing for example), the processor speed is set up to 600Mhz. It's the lowest value of SpeedStep. When you run something that needs more power (games?), you will see the processor speed going up. Everything is just right... Except of the fact that the new processor has a 533MHz bus, so it is slower in T4x than the previous one, indeed. To upgrade the system you should look for SL7V3 processor (Dothan 2.1GHz, 400MHz bus, micro-fPga socket).