Re: [gentoo-user] new machine : CPU : 22 nm vs 32 nm

[Евгений Пермяков]

On 07/26/2012 05:50 PM, Michael Mol wrote:
> On Thu, Jul 26, 2012 at 9:43 AM, Евгений Пермяков <permeakra@×××××.com> wrote:
>> On 07/26/2012 12:05 AM, Philip Webb wrote:
>>> I've listed what's available at the local store,
>>> which I trust to stock reliable items, tho' I wouldn't ask their advice.
>>>
>>> All the AMD's are  32 nm , while the Intel recommended by one commenter
>>> -- Core i5-3570 4-Core Socket LGA1155, 3.4 Ghz, 6MB L3 Cache, 22 nm --
>>> is  22 nm : it costs  CAD 230  & they have  3  in stock,
>>> which suggests demand, but not the most popular ( 9  in stock).
>>>
>>> Isn't  22 nm  going to be faster than  32 nm  ?
>>>
>>> In the same price range, AMD offers  Bulldozer X8 FX-8150 (125W)
>>>    8-Core Socket AM3+, 3.6 GHz, 8Mb Cache, 32 nm  ( CAD 220 ,  2  in
>>> stock).
>>>
>>> How do you compare cores vs nm ?
>>> How far is cache size important ( 6 vs 8 MB )?
>>>
>>> When I built my current machine 2007, the CPU cost  CAD 213 ,
>>> so both look as if they're in the right ballpark.
>>>
>> If you're building new, performance-oriented box, you should take latest
>> intel with AVX because of AVX.  As I recall, recent gcc has support for avx,
>> so some performance gain may be achieved.
>> If you want home box, you may be interested in AMD A8 and similar chips, as
>> they are reasonably fast and very chip
> AMD parts have had AVX since the Bulldozer core release in Q3 2011.
Are they already available in reasonable numbers on market?
>
>> In any case, I'd put most of my money in 2-4 big 3Tb HDD's for media and 8+
>> Gb fast memory, as modern browsers eat memory like crazies and CPU is
>> usually fast enough. Decoding HDTV mkv's should occur on gpu block in any
>> case, so general performance for most uses is irrelevant, as it was fast
>> enough four yesrs earlier. Simply check, that you can offload HDTV decoding
>> to GPU in your config.
> Here, you're talking about either VDPAU or VAAAPI support. VDPAU is
> only offered by nVidia cards, and even then you need to run the
> proprietary driver. VAAPI is supported by Intel graphics and ATI's
> proprietary driver.
I do not see any problems with this. A blob in system is not best 
practice, of course, but it does not need any configuration and is not a 
performance bottle-neck, so there is no reason to care.

I personally would prefer AMD A8 if I can offload decoding to GPU unit 
there (not sure if I can, so won't change my box till next summer), but 
discrete video card will not be the most costly part in good non-gaming 
box, hard drives will, so again, what the matter?
>   There's talk about using VDPAU as a backend to
> VAAPI, but everything I read on the subect says things like
> 'potentially' and 'could be'.
>