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From: Greg Smith <greg@2ndquadrant.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Bob Dusek <redusek@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: performance config help
Date: Mon, 11 Jan 2010 18:17:08 -0500
Message-ID: <4B4BB174.6020608@2ndquadrant.com> (raw)
In-Reply-To: <dcc563d11001111444w6251c638y2aa39f386fb0d1d8@mail.gmail.com>
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	<4B4BA058.4070703@2ndquadrant.com>
	<dcc563d11001111444w6251c638y2aa39f386fb0d1d8@mail.gmail.com>

Scott Marlowe wrote:
> The DDR3 Nehalem and DDR2 AMD are both actually pretty close in real
> world use on 4 or more socket machines.  Most benchmarks on memory
> bandwidth give no huge advantage to either one or the other.  They
> both max out at about 25GB/s.
>   
The most fair comparison I've seen so far is 
http://www.advancedclustering.com/company-blog/stream-benchmarking.html 
which puts the faster Intel solutions at 37GB/s, while the Opterons bog 
down at 20GB/s.  That matches my own tests pretty well too--Intel's got 
at least a 50% lead here in many cases.

-- 
Greg Smith    2ndQuadrant   Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com  www.2ndQuadrant.com

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