[gmx-users] 32 bit dual core or 64 bit single core?

[Beniamino Sciacca]

thanks very much Yang and Florian
Bye


Yang Ye wrote:

> You are comparing two different platform with different CPU and 
> architecture, so it is hard to make a direct statement. You need to 
> test it out by you.
>
> If comparing same CPU, running both 32bit and 64bit (in the case of 
> AMD 64bit as well as Intel CPUs with 64bit EMT), they are almost the 
> same, because as previously stated, SSE/SSE2 is almost not affected. 
> Eric has a post before regarding AMD's 64bit opteron, "not so much". 
> But, to date, (dual-core) Opteron is still the best cost effective 
> configuration. I do think Intel's 2006Q3's offer of Conroe-based CPU 
> will be something better but AMD may have some new that time.
>
> Yang Ye
>
> Beniamino Sciacca wrote:
>
>> thanks for your answer... but in my post i made a mistake: "...or is 
>> better an AMD turion 64 (that is single core but work on 64 bit, and 
>> gromacs could works on "64" bit)?". so... is gromacs 64 bit on a  64 
>> bit processor faster than gromacs 32 bit on 32 bit processor dual 
>> core (like centrino duo)?
>> thanks
>>
>> Beniamino
>>
>>
>> Yang Ye wrote:
>>
>>> First, running gromacs on laptop is a fast way to kill it. To keep a 
>>> laptop CPU running at 100% all time is a challenge even to a  
>>> energy-sensitive smart centrino or turion. They simply have no way 
>>> to escape. =)
>>> Second, because Gromacs' advantage is its assembly loops using 
>>> SSE/SSE2, which is not part of x86 instruction. Besides, AMD's 64bit 
>>> is fully compatible 32bit software.
>>>
>>> Dual core shall be better but you need benchmark for it.
>>>
>>> Yang Ye
>>>
>>> Beniamino Sciacca wrote:
>>>
>>>> Hi community!
>>>> I'm new on this mailing list, so excuse me if i make some mistakes.
>>>> I've to work with Gormacs for the analysis of the interaction of 
>>>> some molecules of DNA.
>>>> For this purpouse I must buy a notebook; obviously i need a very 
>>>> performant computer...I've not much time!
>>>> My question is:
>>>> is better an intel centrino duo (dual core, but unfortunately works 
>>>> only on 32 bit) or is better an AMD turion 64 (that is single core 
>>>> but work on 64 bit, and gromacs could works on 32 bit)?
>>>> which is more performant with the use of gromacs?
>>>> are there some differences?
>>>>
>>>> thanks very much
>>>> Beniamino (superbenji83 at yahoo.it)
>>>>
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>>>
>>>
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>>
>>
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