It may depend on several things.  I got an HP 7800 SFF and the latency looked 
pretty good, until I started using a custom usb device with it (necessary for 
my 
setup), and then I started getting realtime errors while running linuxcnc. 
Switched to a Dell 745 and have had no such problems.

Moses

On 10/12/2015 11:16 AM, Kirk Wallace wrote:
> On 10/12/2015 08:57 AM, Claude Zervas wrote:
>> Um, no, that HP 7800 SFF has *terrible* latency - it will spike up to
>> 133,000 after 20 minutes or so.
>> Based on Kirk's recommendation I bought the same one on ebay and installed
>> LinuxCNC 2.7 but the latency was really bad. I tried turning off every
>> power saving features in the bios and all the tricks listed in the LinuxCNC
>> wiki without success.
>> If someone has information about what can be done to fix the latency
>> problems on these machines I would really appreciate it! So far this
>> machine is basically an ugly door stop.
>>
>> thanks,
>> - Claude
>
> Sorry if the HP didn't work for you. Mine are still working very well.
> Peter has been using these too. You might check with Peter Wallace at
> Mesa to see how his are working.
>
>

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