These links may be of interest to anyone wishing to run Turion 64 on s754 board:
Especially the last link is important. It turns out some great AGP boards like Asus K8N-E are compatible. My Gigabyte GA-K8NE isn't listed, but its first BIOS is from dec 2005, so there is hope. From VIA boards I have MSI K8T Neo V.
MT-34 and ML-34 are the only two CPUs practically available as AMD CPUs were used in cheap laptops only. Good luck finding MT-37 / ML-37 or better.
The problem is also possible clock speeds
1800Mhz CPU, 200Mhz base, 9x multiplier, HT 800, 400 memory (divisor 9) - base clock
2200Mhz CPU, 245Mhz base, 9x multiplier, HT 980 (4x) / 735 (3x), 400 memory (divisor 11) - too high HT speed, won't be stable, with 3x multi HT speed is too low
2200Mhz CPU, 259Mhz base, 8.5x multiplier, HT 777 (3x), 400 memory (divisor 11) - HT speed slightly lower, will be probably slightly slower than Clawhammer 2.2Ghz <-- good pick
2266Mhz CPU, 266Mhz base, 8.5x multiplier, HT 798 (3x), 412 memory (divisor 11), 378 (divisor 12) - too high or low memory speed
2400Mhz CPU, 266Mhz base, 9x multiplier, HT 798 (3x), 400 memory (divisor 12) - edge of stability for CPU <-- top performance
When I ran my Clawhammer 3400+ as 3700+ temporarily for 3d mark, I ran it using 266Mhz base and 9x multiplier (last option). It gives correct HT speed and memory speed so it is the best option. I wouldn't recommend doing it with Clawhammer as the CPU already has very high power consumption as is and getting a bit more performance is not worth the risk of damaging an old board. An OCed CPU with higher voltage will draw more power.
It may be an interesting choice for someone looking for a Clawhammer 3400+, which are not cheap anymore. Get a MT-34 / ML-34 and run it at 2.2Ghz with 259Mhz base clock. All Turions should run at 2.2Ghz without insane voltage and consume less power than a Clawhammer. You also get SSE3.
Pentium III 900E,ECS P6BXT-A+,384MB,GeForce FX 5600, Voodoo 2,Yamaha SM718
Athlon 64 3400+,Gigabyte GA-K8NE,2GB,GeForce GTX 275,Audigy 2 ZS
Phenom II X4 955,Gigabyte GA-MA770-UD3,8GB,GeForce GTX 780
Vishera FX-8370,Asus 990FX,32GB,GeForce GTX 980 Ti