[BioC] Affymetrix 500k SNP chips -- copy number/LOH/deletions

[James W. MacDonald]

Sean Davis wrote:
> 
> 
> On 8/17/06 9:34 AM, "Stephen Henderson" <s.henderson at ucl.ac.uk> wrote:
> 
> 
>>I have 4Gb of memory and I'm running linux. Unfortunately its not 64-bit so Im
>>not sure if R can even use all that memory. I understand that 8Gb is the
>>maximum even on 64-bit though, is that not true?
> 
> 
> I don't think that is true in general, but it could be true for your
> hardware, I suppose.

No it's not true. A 32 bit OS can address 2^32 bits of RAM, whereas a 64 
bit OS can address 2^64 bits of RAM (1.84 x 10^13 Gb). As Sean notes, 
this is hardware dependent - for instance, the box on my desk right now 
can only take 16 Gb RAM in 8 X 2Gb sticks. However there are comps that 
will hold enough RAM that percentage-wise, the only real cost is for the 
RAM itself.

Jim


> 
> Sean
> 
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-- 
James W. MacDonald, M.S.
Biostatistician
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
734-647-5623


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