Well, bottle did post a guide on A64s before but I found this and decided to format it nicely and post.
Specs of all available processors :

From the same article, some technical specifications of all the chips.
Socket 754:
Clawhammer:
Specs: 1MB Lvl2 Cache, multiplier is one lower than the Newcastle variety of the same rating.
Ups and Downs:
- 1MB Cache
- Overclocks nicely if you get a CG revision
- Lower multiplier
- You’re gonna wish you’d gotten a NewCastle when you get C0, they have horrific memory controllers to our standards.
- It may be a bad Clawhammer, in that case you’ve gotten one with only 512KB cache and the NewCaslte multiplier. Don’t think it’ll OC like a Newcastle however, because it won’t. If you get one like this, you have the worst of both sides.
- Single Channel memory controller
NewCastle:
Specs: 512KB Lvl2 Cache, multiplier is one higher than the Clawhammer variety of the same rating
Ups and Downs:
- Guarantueed of a CG revision, meaning they all OC pretty nicely
- Less cache = less Vcore required = less heat = even better OC
- The multiplier, get yourself a 3200+ and you’ve got plenty of multi to play with, so that you don’t need uber ram or a major HTT divide to get high clockspeeds
- Only 512KB Lvl2 Cache
- Single Channel memory controller
Socket 939:
Newcastle 939
Specs: 512KB Lvl2 Cache, multi equal to Sct 754 version.
Ups and Downs:
- Guarantueed of a CG revision, meaning they all OC pretty nicely
- Less cache = less Vcore required = less heat = even better OC
- Dual Channel memory controller
- The multiplier
Clawhammer 939
Specs: 1MB Lvl2 Cache, multiplier is UNLOCKED!!*
Ups and Downs:
- Unlocked multiplier*
- 1MB Lvl2 Cache
- Dual Channel memory controller
*) Only for the FX’s, not for the 4000+, which is the only locked Clawhammer 939, at a 12x multi.
Winchester
Specs: 512KB Lvl2 Cache, Multiplier is 1 lower than the newcaslte variety (3200 Winchester = 3000 newcastle 754)
Ups and Downs:
- 90nm
- OCes like mad
- Dual Channel memory controller
- The price (lower than expected)
- Only 512KB cache
- There’s a chance you get a bad one
Venice
Specs: 512KB Lvl2 Cache, Multiplier is equal to Winchester version.
Ups and Downs:
- 90nm
- Strained Silicon
- New and improved E.rev/Mem controller
- Dual Channel memory controller
- OC’s insanely
San Diego
Specs: 1MB Lvl2 Cache, multiplier is UNLOCKED!!!**Ups and downs:
- 90nm
- Unlocked multiplier*
- 1MB Lvl2 Cache
- Dual Channel memory controller
Manila:
- Dual Core
- 90nm
- Cheap
- 2 x 256 = decent 512kb Cache
- DDRII 667Mhz bus***
- DDRII 667Mhz bus***
- Q206…
Windsor:
- Dual Core
- 90nm
- 1MB cache
- Security Virtualization
- DDRII 667Mhz bus***
- DDRII 667Mhz bus***
- Q106…
Toledo:
- Dual Core
- 90nm
- 2MB cache
- Security Virtualization
- DDRII 667Mhz bus***
- DDRII 667Mhz bus***
- Q106…
- One FX is expensive, now how about two…
The article also has great info on OC’ing specially for newbie’s.
Finally here is the source.
Edit:
This was my special 300th post !