INTEL ATOM OVERCLOCK

"Overclocking is the process of making a computer or component operate faster than the clock frequency specified by the manufacturer by modifying system parameters. Operating voltages may also be changed (increased), which can increase the speed at which operation remains stable. Most overclocking techniques increase power consumption, generating more heat, which must be dispersed if the chip is to remain operational"

There are many tools to speedup CPU like ASUS Super Hybrid Engine, EEEctl, Setfsb,  SetPLL, ClockGen ect.

But the only programs that i find working with Intel Atom Z5xx series are:

• ASUS SHE (see post) 
• SetFSB (Shareware or Freeware) included in Optimus IEMGD
  
• Probably RwEverything future versions will support WRITE function for my clockgen
  

SetFsb SHAREWARE (the price is  800 JPY = 8€ = 10$); Seems no more avaiable!

1. Insert your Clock Generator name (only first time, depends from mainboard if you don't know you can find this information reading from this list or looking at your pc datasheet from HERE.For Example ASUS 1101HA clockgen is  (as you can see from the picture)

     2. Click on Get FSB and Move Slide to a new value (right side increase frequency)

Test Device:

Z520@1.33

1GB Ram 800Mhz

Windows 7 Home Premium 32bit

Original GMA 500 Driver

After some tests i found the right setting for Asus 1101HA reaching  about 1.81Ghz (stable frequency)

ITA.Dopo qualche test ho raggiungo facilmente la frequenza massima di funzionamento della mia CPU impostando:

SetFsb: 180.4

Max Freq: 1.808

Good result with +475MHz  because it doesn't improve only CPU but also GPU and RAM!

N.B. Remember that max overclock changes for each pc so you will find your stable frequency:

-for example in my case

1.82GHz instable

1.811GHz instable after fullstress 30min (rare situation in normal use)

ITA. Sicuramente un buon risultato ma non eccezionale perchè speravo di raggiungere 1,86GHz come lo Z540 :)

Temperature by SpeedFAN (fullstress 30 min) GOOD!

HD 40°

Temp1° 70

Core°59

Conclusion: SetFSB Shareware is really simple to use (you don't need to know how works pll). I don't suggest at ASUS users to buy Setfsb because 8€ for about + 60-80Hz (Z520 with SHE 30%=1.74MHz) it's a waste of money. Maximum frequency reacheable depends by all system hardware and O.S. so don't cry if your computer can't go over a goal.

SetFsb FREEWARE

Instructions for clockgenerator ICS9LPR427CGLF (ASUS Eee PC T91MT/T91/T91SA/1101HA/1201HA/1201PN) [without build a PLL file]

1. Close Asus SHE (if you have it)
2. Download SetFsb FREE from here
3. Run Setfsb freeware
4. Go to Diagnosis Section
5. Click on Get FSB
6. Move to one of these offset 0B or 0C (edit hex value,click on update and after Apply!)

Note.How to apply this solution on other PLL? Just test! change one offset for each time modifing second value with a next to value for ex E1 test E0 or E2

My Experiment:

After Click Get FSB on setFsb i've got these two values:

For Asus 1101HA (z520) starter values for 1331.4MHz are OB=FC and OC=4F

• Editing ONLY 0C : TEST 1 with 1GB ram 800Mhz on Windows 7

Edit 4F value; Range= from 31 to 66

Some example

value 0C=31 CPU clock is 831.3 MHz

value 0C=60 CPU clock is 1614.7MHz

value 0C=66 CPU clock is 1714.7MHz

----

TEST 2  DONE WITH ATOM Z520 1.33GHz with 2GB RAM 533MHz on WINDOWS 8.1 PRO

0B Offset accept only Fx-Bx-7x-3x values (x= a letter or a number 0;1;2;3;4;5;6;7;8;9; A;B;C;D;E;F )

[Approx Frequency Comparison Editing only 0B; 0C=4F]

0B Value	Frequency (MHz)	0B Value	Frequency (MHz)	0B Value	Frequency (MHz)	0B Value	Frequency (MHz)
F0	1659	B0	Fail	70	Fail	30	Fail
F1	1621	B1	Fail	71	Fail	31	Fail
F2	1597	B2	1592	72	1586	32	1582
F3	1564	B3	1561	73	1556	33	1551
F4	1536	B4	1529	74	1526	34	1521
F5	1507	B5	1502	75	1497	35	1493
F6	1479	B6	1474	76	1470	36	1465
F7	1452	B7	1447	77	1443	37	1438
F8	1426	B8	1421	78	1417	38	1413
F9	1401	B9	1397	79	1392	39	1388
FA	1377	BA	1373	7A	1368	3A	1364
FB	1353	BB	1349	7B	1345	3B	1341
FC	1331	BC	1327	7C	1323	3C	1318
FD	1309	BD	Fail	7D	Fail	3D	Fail
FE	Fail	BE	Fail	7E	Fail	3E	Fail
FF	Fail	BF	Fail	7F	Fail	3F	Fail

Seems that frequency decrease with Horizontal Offsets so if change value for ex FA->BA->7A->3A = - 5MHz

Linear improve frequency=  +23MHz

Fail may depends by:

-HW limit (probably RAM limit because it's operate at 533MHz; with 2gb Ram 800Mhz can improve OC limit)

-Intel Speedtech  (voltage control)

-Operative System read above "Downclock"

0C offset accept only numeric values 

[Approx Frequency Comparison Editing only 0C]

On my netbook standard 0C=4F but for 4x values accepeted only 4F=1331 and 4E=1314

0C Value	Frequency (MHz)
50	1348
51	1364
52	1381
53	1398
54	1414
55	1431
56	1448
57	1464
58	1481
59	1498
5A	1514
5B	1531
5C	1548
5D	1565
5E	1581
5F	1598
60	1614
61	Fail

Seems that frequency increase linearly = +/- 17MHz

NOTE. THE MAX FREQ WITH MY LAST RAM 2GB Corsair 800MHz with the free method is 1.7481GHz Using 0B= FC + 0C=68

----------------

[DOWNCLOCKING: PowerSaving] From ATOM Z5xx series datasheet min freq is 800MHz:

On Win8.1 isn't possible to downclock device, probably because MS win 8 adjust CPU multiplier automatically from x10 to 6x (depends on CPU load)

If I set 8OFSBx10Multipler=800Mhz when MS adjust multiplier 80x6=480Mhz system fail!

the minimum stable freq that i reach is with 0B=7C that with multiplier x6=794MHz (better leave directly standard freq 133.1x6=798MHz)

Summary with different RAMs

Atom Z520 with RAM 533MHz (HYS64T256020EDL-35-C PC2-5300S) under Win8.1 PREVIEW

MinFreq STABLE=1329MHz (with x6 Multipler 793.8MHz) ->0B=7C

MaxFreq STABLE=1583MHz (1598MHz fails after a deep test;probably there are other values in this range) ->0B=F5 + 0C=53

Atom Z520 with 1GB RAM 800MHz (Asint SSY2128M-JGEEF) under Win8.1 PREVIEW

MaxFreq STABLE= Tested  0B=FD + value 0C=69 CPU clock is 1734MHz  (for 0C=67 1731.1MHz)

Not other max frequencies tested because is a 1GB RAM (too slow on win8.1)

Atom z520 with 2GB RAM 800MHz (Corsair Value VS2GSDS800D2)under Win8.1 PREVIEW

MaxFreq STABLE=NOT Tested

Atom z520 with 2GB RAM 800MHz under Win7 SP1 Updated 12 April 2014

MAx Freq STABLE 1748.1GHz 0B=FC OC=68

Note: Windows 8 TaskManager Performance's Tab doesn't show CPU Overclocked Frequency! Use CPUz

Advanced (don't play with it): MAY RETURNS HW FAILURE! DON'T USE IT!

03 Value (Stock F3)	FSB	DDR	AGP	PCI
C3\C5\41	66.8	200.4	66.8	33.4
01\03	66.8	205	68.3	34.2
81	68.3	205	68.3	34.2
C4\40	70	210	70	35
00\02\80	83.3	166.6	55.5	27.7
D1\D3\D5	100	200	66.8	33.4
11\91	107	214	71.3	35.7
D2\D4\50	112	224	74.7	37.3
10\90	124	248	82.7	41.3
F1\F3\F5\F7 51\71	133.6	200	66.8	33.4
EF\E3\61	133.6	200	66.8	44.5
B3\B5\31	137.3	206	68	34.3
A3\21	138	276	92	46

Good Overclock!

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DOWNCLOCKING by DOS or BATCH File

NB. THIS METHOD WORKS only with Intel SpeedStep ENABLED (CHECK YOUR BIOS: By default is enabled).

What does it do? Downclock your CPU freq by reducing CPU Multipler or you can disable auto downclocking (set CPU at only a frequency)

1)Open a dos prompt

2)By default in MS there are High Performance, Balance Performance, Low Performance profiles

->Default MS is Balanced

->You can also create it by dos or by windows (check Battery Saving Settings)

In dos these standard schemes are called SCHEME_MAX ; SCHEME_MIN ; SCHEME_BALANCED

3) Reduce CPU Multipler for the MAX frequency

Code example: powercfg -setacvalueindex SCHEME_BALANCED SUB_PROCESSOR PROCTHROTTLEMAX (0-100)

Info:

SCHEMEBALANCED= Balance Profile

-setACvalueindex means set this value for AC= with wallcharger

-setDCvalueindex means set this value for DC=with battery

PROCTHROTTLEMAX= Processor throttle max (you can also edit the min with value PROCTHROTTLEMIN)

(0-100)= just insert a value from 0 to 100. For example 5

Example: Set in Balance Profile,when the wall-charger is plugged in, the max multipler to value 5%

powercfg -setacvalueindex SCHEME_BALANCED SUB_PROCESSOR PROCTHROTTLEMAX 5

Let's say that my Atom Z520 1.33GHz supports these Multipler x6 - x8 -x10:

Formula: Bus Speed 133Mhz x Multipler

1.33GHz  for value 100 (MULTIPLER x10) ->with ASUS SHE in Power Saving: 1GHz

1GHz for values from 80 to 99 (MULTIPLER x8) -> with ASUS SHE  Power Saving: 600/800 MHz

800MHz for values from 0 to 79 (MULTIPLER x6) -> with ASUS SHE in Power Saving: 600MHz

3)After lunch the code let's apply the profile

powercfg -setactive SCHEME_BALANCED

Why downclocking? Reduce Hardware Temperature,increase battery life, reduce fan noise anyway reduces also cpu speed :)