Even nForce 680i LT SLI uses the nForce 650i SLI SPP. Both the AnandTech review and the The Tech Report review say the 680i LT SLI SPP is labeled C55-P-N-A2. But this is exactly the nForce 650i SLI SPP as you can see from this ASUS P5N-E SLI review.
Basically all of
- nForce 650i SLI
- nForce 680i LT
- ASUS P5N32-E SLI Plus
- ASUS P5NT WS
have the same SPP C55, with apparently different part numbers
- C55-P-N-A2
- C55-SLIX8N-A2
- NF650I-SLI-N-A2
- NF680ILT-SLI-N-A2
Only the pure 680i SLI SPP is C55XE, with part number C55-SLIX16N-A2 or NF680I-SLI-N-A2.
But the distinction between C55 and C55XE is very obscure and as a matter of fact
C55 = C55XE
from their specs.




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