He's running the amd64 branch of Debian, which, as the Debian page  
states:

"AMD64 has been an officially supported Debian architecture since the  
release of Debian 4.0 (etch).
The port consists of a kernel for all AMD 64bit CPUs with AMD64  
extension and all Intel CPUs with EM64T extension, and a common 64bit  
userspace."

The amd64 branches of most OS's are just their branch which supports  
amd & intel 64bit CPU's.  It's just that AMD had their 64bit cpu out  
before Intel, so all the branches of these OS's ended up getting  
called amd64, in support of the amd 64bit extensions, that are  
terribly similar in intel's 64 bit cpu.

Additionally, modern 64bit CPU's should run their 32bit binaries at  
comparable or better performance of an equivalent-speed 32bit cpu.   
(Better, since they tend to have better designs for running all  
code.)  As it's not an emulation layer, they aren't likely to ever  
perform significantly worse.

-Joe

On Jan 16, 2009, at 1:21 PM, Peter Lindblom wrote:


> Hi !
>
> isnt running a amd binary stupid when having a Intel cpu ?? maybe Im  
> wrong
> here but I wouldnt ..
>
> and I hope you know that 64-bit OS and 32-bit game source isnt that  
> 100%
> good ..
>
> Peter
>
> ----- Original Message -----
> From: "Steffen Tronstad" <[email protected]>
> To: <[email protected]>
> Sent: Friday, January 16, 2009 11:21 AM
> Subject: [hlds_linux] Source - 450 FPS
>
>
>> Hi all,
>>
>> I've put up a new linux server today, and when I start a CS: Source
>> server with -tickrate 100 and fps_max 600 in the command line, it  
>> just
>> gives me an average FPS of 450, ranging from 360 - 590 when I type
>> 'stats' (no players, 1 SourceTV bot)
>>
>> When I played on the server, it seems like the server is running  
>> only on
>> 60-70 ticks.
>>
>> Dual Intel Dual-Core Debian Lenny 2.6.26-1-amd64 #1 SMP 3,2 GHz  
>> with 8
>> GB RAM. Spawned 16 instances.
>>
>>
>>
>> Steffen
>>
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>>
>
>
>
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