[mythtv-users] Is interleaving memory still the best bet for an Atom?

Scott Smith pickle136 at sbcglobal.net
Tue Jan 10 19:06:26 UTC 2012


Just to add i most (if not all) atom/ion systems are single channel. At least I have a Pineview System which fairly recent and it was still single channel.
Biggest issue i have with the ION2 is theres no (reasonable) way to really use the nvidia vdpau with mythtv.

--- On Tue, 1/10/12, Matt Emmott <memmott at gmail.com> wrote:

From: Matt Emmott <memmott at gmail.com>
Subject: Re: [mythtv-users] Is interleaving memory still the best bet for an Atom?
To: "Discussion about MythTV" <mythtv-users at mythtv.org>
Date: Tuesday, January 10, 2012, 1:37 PM



On Mon, Jan 9, 2012 at 4:03 PM, Raymond Wagner <raymond at wagnerrp.com> wrote:

On 1/9/2012 14:47, Matt Emmott wrote:

> A friend of mine is looking into the Zotac Zbox to replace a failed

> Front End. I remember reading some discussion on this list that two

> RAM sticks are better than one, as the interleaving will help video

> playback performance.



You're talking about two completely different things.  A memory module

is going to contain a number of banks, and each bank may be busy on some

task at any given time.  If a bank is busy, a different bank can be

accessed in the mean time.  In hard drive terminology, consider

non-interleaved memory to be like a bunch of spanned drives, while

interleaved memory to be like a RAID0 stripe.  Better for some types of

load, worse for others, but really not something you should need to be

concerned about.



On the other hand, one module versus two is about memory channels.  Most

modern systems have two channels, while higher end ones can have three

or four.  Two modules of DDR3-1333 on one channel will do 10GB/s,

regardless of whether it is interleaved or not.  Two modules on two

separate channels will do 20GB/s.



On older ION systems, the video chip ran off the system memory, and

system memory became a real issue as some users found low speed memory

would starve the decoder.  On newer ION2 systems, the video chip has

dedicated memory, and since the CPU itself isn't doing much of anything

(and doesn't have the power even if you wanted it to), memory

performance isn't that important.  Of course, with memory as cheap as it

is, there is no point to trying to save $10 by only getting one stick of

memory.

_______________________________________________


Thanks, that is helpful. And as for pricing, he got impatient and spent the extra $12 for two sticks, just in case. 



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