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

[microcai]

CPU speed does not matter. what matters most is the I/O speed.

As far as I can tell, AMD chip suffered with a lot of I/O. Their
Hyper-transport seems not competitive with Intel's ring bus


2012/7/26 Michael Mol <mikemol@×××××.com>:
> On Thu, Jul 26, 2012 at 10:18 AM, Евгений Пермяков <permeakra@×××××.com> wrote:
>> 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?
>
> http://www.cpubenchmark.net/cpu.php?cpu=AMD+FX-8120+Eight-Core
>
> At $150, fitting into existing Socket AM3+ boards, that looks like the
> best part for my money right now.
>
>>>> 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 only bring it up because some people do care. I'm running fglrx at
> home right now. When I run nVdia, I run the nVidia drivers. In part
> because I like accelerated video decoding (which a Geforce 210 does
> wonderfully), in part because the nv, nouveau and radeon drivers
> historically worked very poorly for me in 2D performance when faced
> with multiple 1080p displays. They're always getting better, of
> course.
>
>>
>> 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?
>
> Computer usage breaks down into more than gaming and non-gaming. My
> "non-gaming" boxes at home tend to have their CPU, RAM or NICs as
> their most expensive components, because that's where I need them to
> perform better.
>
>
> --
> :wq
>