"Frequency (in Hz) that should try to complete individual work chunks. Higher numbers may run slower but will provide a more responsive system. Lower may be faster but more laggy. default 60 (corresponds to 60 fps [frames per second?])"

Can anyone clue me in on this setting? I've tried "Googling" it for awhile and couldn't find any explanation for it or when (if ever) the default setting should be changed. Here's some info on my PC and prefs, in case any of them make a difference in using the default setting or not

CPU: AMD-FX 4300 Quad core 3.8 Ghz
HD: 2 TB
MB: Asus M5A97
OS: W7 Ultimate 64-bit SP1
PS: 650W
PAGE FILE: 8 GB
RAM: 8 GB
VM: 16 GB
VIDEO CARD: AMD Radeon HD 6570 w/1 GB RAM (this card does not support "double precision")

BOINC PREFERENCES:
Computing allowed while CPU in use YES
Computing allowed while GPU in use YES (applies to Einstein@Hm)
Computing allowed while CPU usage is less than 0% (= no restriction)
Restrictions on hours or days of usage NONE
Switch between applications every 60 minutes
Use at most 100% of CPUs
Use at most 50% of CPU Time
Max Download rate ---
Max Upload rate ---
Transfer at most 0.00 Mbs every 0 days
Min work buffer 1 day
Max additional work buffer 1 day
Skip Image File Verification NO
Confirm before connecting NO
Disconnect when done NO
Network usage allowed 24/7 - no restrictions
Use at most 10 GB disk space* (have never used +2.5 GB so far)
Leave at most 90 GB disk space free* (I have 1500 GB free)
Use at most 5% of total disk space*
Tasks checkpoints at most every 999 seconds
Use at most 50% of page file
Use at most 75% of memory when PC in use
Use at most 75% of memory when PC is idle
Leave apps in memory while suspended YES

Think of it like the time slices windows is using to switch between processes.

Here it is the work that is split into pieces.
Lets use the gpu-target-frequency with default 60 (= 60Hz) as an example:
The work is split into small pieces so that 60 pieces can be done per second.
This way the gpu can 60 times per second do what it usually does.
The lower the frequency, the bigger the pieces are and that means less times per second for the gpu to do something else. If the frequency is too low (the pieces are too big) the system starts to feel laggy, if the frequency is too high (small pieces) the gpu is wasting time waiting for the next piece of work.

It depends on the gpu if you need to change the frequency for optimum use of it.
A HD79xx can work well with a far lower frequency than the default while a HD38xx needs a higher frequency to keep the system responsible.