Look at those benches goodman528:
http://anandtech.com/cpuchipsets/showdoc.aspx?i=2771&p=5
The minimum framerate in FEAR 1.05 @ 1024x768 was 53 fps for the FX62... the Core 2 Duo Extreme X6800 scored 80 fps.
Thanks. Comparing conroe with X2 4200 (939 socket), conroe gives 125 fps, 4200 gives 86 fps, at 1024x768 high setting, average. Seems to be quite a difference. Shame conroe isn't in the CPU charts.[/quote
At this time unless Intel has worked amiracle that I am not aware of the Conroe/Woodcrest have alimitation on their ablity to move back and forth between 64bit and 32 bit software. Using 32 bit software EM64T is limited to 4gb gross of addressable memory. If and when vista gets here that may be a problem.
CPUs with this technology have a new operating mode, called IA32E, which has two sub-modes:
* Compatibility mode: Allows 64-bit operating systems to run 32-bit and 16-bit software unmodified. The operating system can have 64-bit (in 64-bit mode), 32-bit and 16-bit (both on compatibility mode) programs running at the same time. However, 32-bit programs will run as if they were running on a 32-bit CPU, i.e. will access only up to 4 GB of RAM. The same idea goes to 16-bit program, that will still access only up to 1 MB of RAM.
* 64-bit mode: Allows 64-bit operation systems to use the new 64-bit addressing space provided by this technology.
As you can see above, EM64T technology can only be used by 64-bit operating systems, like the forthcoming Windows 64. 32-bit operating systems, like Windows XP, will continue to run under regular IA32 mode, i.e. using the regular 32-bit addressing space – in order words, can access only up to 4 GB RAM.
In plain English, Windows nowadays cannot take advantage of EM64T technology since it is still a 32-bit operating system.
f you use “heavy” applications and are thinking of moving to 64-bit computing to have more than 4 GB RAM available, keep in mind that you will need new 64-bit version of your software, or they will still access only 4 GB RAM, thus not solving your problem.
Also keep in mind that the external address bus of EM64T-based CPUs isn’t 64-bit wide, so no Intel CPU using this technology can access 16 EB (exabytes) of RAM (2^64), as you may think. The maximum amount of RAM memory a CPU can access under 64-bit mode depends on its implementation. 64-bit Celeron D, Pentium 4 and Xeon CPUs can access up to 64 GB of RAM while 64-bit Xeon DP can access up to 1 TB of RAM. Once again, keep in mind that under 32-bit mode or 64-bit compatibility mode, the CPU accesses only 4 GB of RAM, even if it is a “64-bit CPU”.
http://www.hardwaresecrets.com/article/262
The opteron Class and AM2 are not under these restrictions.