I have several Dual Athlon MP systems (mainly Tyan and ASUS boards) set up as workstations. A problem I recently encountered is with a system running Athlon MP 1900+ processors. WCPUID denotes that SSE is enabled, but the program I run is stuck with 3DNow instruction set. What am I overlooking? Why is the program not running with SSE. I am using the proper -forceasm flag in the CLI to cause SSE to be selected preferentially, but it always goes with 3DNow. My other systems will run SSE no problem. I am puzzled. Thanks.
Was this an upgrade from a previous version processor by any chance?
If you installed the OS when you had a previous generation processor (say T-Bird version MP) and just upgraded the CPU, then this is likely your problem.
The OS will only look at processor features when it is first installed. It determines what features the CPU supports then loads the appropriate DLL's, etc. If you upgrade the CPU any time after the initial install, then the OS will not know that new features have been added (like SSE) and therefore will never enable support for them.
Therefore, if this is the case, then to get SSE support you will need to perform a fresh install of the OS. A re-install will not work, you need to wipe the drive clean and re-install the OS from scratch.
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Mouaip :/ ... if you run NT Kernel based OS, it's possible to upgrade the processor within the OS.
The best way is to restart a full install. After the license screen (usually the one you must strike F8 to accept the license), the install software detects installed OS and ask for a re-install. This way provides a new detection of all the hardware components and re-use all the drivers and keeps all external software previously installed