I read that 2520m and other CPUs have different sockets, so I don't know if every model will fit into my model.
Please help and regards, MB
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Depending on the price and the amount of heat and battery you are comfortable working with, the recommendations are different. I upgraded my T530i from a 2nd gen i3 to i7-3720qm engineering sample and I have no regrets with this upgrade, though I ended up using liquid metal to keep the i7-3720qm cool when the NVS 5400m is also stressed. The best solution is to get a new cooler that is designed for 45W CPUs (and with or without dedicated graphics cooling is up to your current motherboard ofc).
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Precision M4300 X9000 8gb 160gb WUXGA Ultrasharp fp W10
T530i 15.6" i7 16gb fp W10
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10 (Sharp)
Lat C840 P4-2.5 2gb 60gb W7 (Ultrasharp)
If you go to the website cpu-upgrade.com, and type in your current processor, it generates a list of pin compatible CPUs. If you cross-reference that list with the Lenovo specs, the intersection (that is, Lenovo's materials indicate they built machines with that CPU, and the cpu-upgrade side indicates those processors that will fit the same socket and that might work the same - you are looking for CPUs on both lists).
This gives you an indication based upon a pretty conservative paradigm. If you want to stretch things a bit to see if you can really hot-rod your machine, you should also check out the TDP (Thermal Design Power) that the highest wattage CPU on the list generates. This number tells you how much power Lenovo was comfortable with a CPU generating in that box. Then you can look at the CPU upgrade list to see if there's any more powerful CPUs (for example, a more recent model) that might work. As a rough guide, you can use cpubenchmark.com to check out how powerful each CPU is. Then off to ebay to figure what's available, and how much it costs. A lot of surplus CPUs are from China, so that might delay shipment, what with COVID-19.
On edit: The cpubenchmark site just changed versions (to v10) for the software that they use for benchmarks (passmark). The new version gives signficantly different numbers than the old program and they changed all the numbers on their site, which was pretty disconcerting to me. They've actually acknowledged that they probably did this wrong and will be changing back to v9 numbers, and will change their new software by a scaling factor. Just don't get confused (like I did!) when you look at how much of a performance boost you should expect.
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