[Skimmertalk] red pitaya, for real?

[Jeff AC0C]

Do NOT use an AMD uP if RTTY skimmer duty is what you want.  This program is 
a monster consumer of FPU calculation capability and while the AMD parts are 
very fast, they suffer from a shared FPU core.  Meaning your zippy new AMD 
8-core speed deamon actually has only 4 FPU cores, and they are shared one 
FPU to two CPU.  My rather ancient and slow (by modern standards) 945 runs 
around 300 decoders under RTTY skimmer despite being "only" a 4-core part. 
That's about the same speed as you get out of the later AMD parts.  Why? 
Because the 945 has a single FPU for each CPU.

The Intel parts by comparison are faster because there is a 1:1 
correspondence between physical CPU and physical FPU cores.  If you really 
want to rock RTTY skimmer in a contest, across 3 active contest bands 
simultaneously and run 96K decodes without throttling, your best bet is 
probably the 6-core Intel i7-5820K.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: kazeringue--- via Skimmertalk
Sent: Thursday, September 01, 2016 9:42 AM
To: skimmertalk at contesting.com
Subject: Re: [Skimmertalk] red pitaya, for real?

Perfect.  That CPU was exactly what I had been eyeing up since the
fx-83xx series was released.  The extra threads are good for running VM's.

CPU's are not moving as fast as digital cameras, but each generation
gets better.  The i7-6700 Nathaniel mentioned is a good choice also.

Thanks for the ideas guys.

73 de w4kaz

> However, my personal Skimmer machine is
> acheapo ASUS mobo with onboard video and audio, 8 GB of RAM, and an AMD
> FX-8350,

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