I recently upgraded my Yonah T2050 Socket M on a Sony Vaio VGN-N130G to a Merom T7600. It's got roughly twice the performance, benchmark wise, and my WEI went from a 4.0 to a 5.6 on the CPU and RAM.
I picked it up on ebay on "Buy It Now or Best Offer" for $55 and now my 4 year old laptop has the CPU power to keep doing all everyday computing tasks--which is pretty useful if I'm on the road and can't use my desktop.
Now I'm looking to upgrade the HDD since it's a 4.3 on the WEI--Old 80GB SATA I 5400rpm. I'll either get a $60 SSD for the IOPS or a $30 7200rpm 2.5" drive.
Hopefully someone finds it useful to know that upgrading a laptop CPU can be perfectly practical.
Sorry, if this is in the wrong thread.
EDIT: I also want to clarify that the new (used, actually) T7600 is running at the full speed fsb of 667MT/s and cpu speed of 2.33GHz.
I haven't noticed a substantial heat increase. It's tough to be precise because I forgot to record my CPU temps prior to the upgrade. My wife's similar Dell 1505 that uses a T2250 hits 78C on LinX. Mine hits 88C now and has slightly worse vents for a similar heatsink. That leads me to believe that my original CPU hit maybe 80C on LinX before and 88C now--so no big heat increase. Tjmax is 100C for this CPU, by the way.
Old Max: 80C
New Max: 88C
The new good thermal compound (Tuniq TX-2) may also dissipate heat better than the original compound.
Keep in mind that LinX causes higher temps than pretty much any real world CPU intensive operations will cause. Also, I live in Guam and don't usually have air conditioning so the humid tropical air bumps my temps up about 10C or so.
Yeah, I know. But I didn't really want to close the thread because I might add a hard drive sometime and it's tough to "best" answer a non-question. You know how the Hot Deals forum doesn't require best answers? Anyways, I'll keep this open another month or so as I hope for a 40GB or larger lousy SSD for $60 or less.