SetFSB allows to change your computer's Front Side Bus (FSB) speed. The utility supports a wide range of chipsets and is easy to use. Just move the slider to set the desired FSB speed and see the resulting CPU speed.

If you are a beginner, do not use this software.
This software is for power users only.
Use "SetFSB.exe" at your own risk.

Supported chipsets:

Intel
440BX
8xx
9xx
G33/P35/P55/X38/X58
5000X/5400X
US15W
NM10
HM55

ATI
Xpress 200/200M
Xpress 3200 Intel
Xpress X1200 [RS690M]
RADEON IGP320
RADEON IGP350[ALI M1533]

AMD
AMD-760(VIA VT82C686/A/B)
AMD-770(RX780)
AMD-790FX/GX

VIA
KT266 - 600
KM400
K8T800(Pro)
Pro133(A/T/Z)
PM133
Pro266
P4M800 Pro
PT880Ultra
VN800
VX700

SiS
SiS630
SiS645
SiS649
SiS651
SiS661
SiS662
SiS671
SiS740
SiS746
SiS748
SiS756
SiS761GX

ULi
M1695[M1567]

Clock - Motherboard:

ICS9148BF-26 (Gigabyte GA-6ZXC)
ICS9248BF-87 (Akimbo AP1200)
ICS9248BF-96 (Fujitsu FMV DESKPOWER C5/86WL)
ICS9248BF-102 (PC CHIPS M755LMR)
ICS9248AF-165 (ASUS CUV4X)
ICS9248EF-199 (Biostar M7SUA, Matsonic MS9357E )
ICS932S401EGLF (SuperMicro X7DA3+, Tyan Tempest i5400PW )
ICS932S421BGLF (Intel D5400XS, Tyan Tempest i5400XL )
ICS94201DF (ASUS TUSL2-C)
ICS94222AF (ASUS CUV4X-E)
ICS94225AF (EPoX EP-8K7A, ASUS A7M266)
ICS94228BF (EPoX EP-8KHA+/EP-8K3A, ASUS A7V333)
ICS94229AF (Soyo K7V Dragon Plus!)
ICS94237AF (Asus CUV266)
ICS950209CF(Fujitsu-Siemens Scaleo L)
ICS950405AF (ASUS K8V, ECS KV2 Lite )
ICS950410AFLF (MSI K8T NEO2-F V2.0)
ICS950703BF (ASUS P4T533)
ICS950812BG (Compaq Presario 2201AP)
ICS950910AF (Medion PowerPlus 3200+, MSI KM3M-V)
ICS951402AG (HP Compaq nc4010)
ICS951403CF (FIC AT31)
ICS951412AG (HP Pavilion ZV6000)
ICS951416BGLF (HP 6515B/6715B)
ICS951417AFLF (Intel D101GGC)
ICS951461BGLF (DFI ICFX3200, LG E200-A.CPPPV, Acer Aspire T660)
ICS951462AGLF (Acer Aspire 5100, MSI GX610)
ICS951463BGLF (Acer Aspire M5610)
ICS951464AGLF (Acer M1100)
ICS952001AF(MSI 645U)
ICS952003AF (ASUS P4S333-C)
ICS952013CFLF (Sony VGC-M1)
ICS952018AF (ACER E661FXM, ASUS P4S800-MX)
ICS952505AF (ASRock 939Dual-SATA2)
ICS952607EF (ASUS P4C800/P4P800, Foxconn 865A01-PE)
ICS952611BF (MSI MS-6728)
ICS952619CF (AOpen AX4SPE Max)
ICS952623CG (Toshiba Satellite P10-554)
ICS952703BF (Asrock K7S8XE+)
ICS952906AGLF (VIA PICO ITX EPIA PX10000G, Fujitsu Siemens Amilo Pro V2030 )
ICS953002DFLF (ABIT IP95)
ICS953008BFLF (ASUS P5VD2-X/VM)
ICS953401CFLF (Fujitsu sienems P5SD2-FM)
ICS953805CFLF (ECS GS7610 ULTRA V1.1C, ASUS A8S-X-UAYZ, Foxconn 761GXK8MC)
ICS954103EF (Gateway 505GR)
ICS954105BF (HP xw4400)
ICS954108CFLF (Intel D955XBK/D975XBX)
ICS954119DFLF(MEDION MD8800[MSI MS-7204])
ICS954123CGLF (ASUS P5W-DH/P5D)
ICS954124AFLF (Shuttle SD37P2)
ICS954127BFLF (ABIT IL9 Pro)
ICS954141CFLF (ASUS P5LP-LE)
ICS954201BGLF (Samsung X20)
ICS954213AGLF (ASUS A6VA, M9V/N, COMPAQ Presario B2800)
ICS954227CGLF (Sony VAIO VGN-S460/S580P)
ICS954310BGLF (Acer Aspire 5570Z/5601AWLMi, Toshiba Satellite L45-S4687)
ICS954321AGLF (TOSHIBA Tecra A-8)
ICS954519BGLF (MSI 975X Platinum PowerUp Edition)
ICS954552CGLF (ASUS N4L-VM)
ICS9LPRS113AKLF (MSI P45 Diamond/platinium/Neo/MegaBook X340/GT640/GX640/GX660/GX740/Wind Top AE2400/GT725, Dell XPS-435/9000)
ICS9LPRS133BKLF (MSI X58 Eclipse SLI)
ICS9LPRS139AKLF (EVGA X58 SLI E762, Foxconn BloodRage, Dell Studio XPS 435 MT, MSI P45 Neo-F)
ICS9LPRS140CKLF (Asrock P55 Pro, ASUS Maximus III GENE/Formula/P7H55-M PRO)
ICS9LPR310BGLF (ASUS N10J/A8JA, Mitac 8258i)
ICS9LPR316AGLF (Kohjinsha SH6/SH8)
ICS9LPR321BKLF (Sony VAIO VGN-FE31Z/41Z, UX series )
ICS9LPRS355BGLF (HP 2510P)
ICS9LPR362AGLF (ASUS N81VP)
ICS9LPR363EGLF (ASUS G1S/G2S /F3SV/F8SV/A7S-7S006C/A6JM/G1Sn/A8SC/G51VX/G60VX/A7Sv/U80V, Intel D945GSEJT, Clevo M570RU)
ICS9LPRS365BGLF (FS U9200 with the hardware remodeling, Acer 7730G/Aspire One model ZA3)
ICS9LPR367AGLF (ASUS Nova Lite EP20)
ICS9LPRS387BKLF (Compal NTUC0 - Unlock TME)
ICS9LPRS397DKLF (HP Compaq 6730b - Unlock TME)
ICS9LPRS419DFLF (ECS 945GCT-M/1333, Acer AM5630, Lenovo 9702 A66, ABIT I45-CV )
ICS9LPR426AGLF (ASUS Eee PC)
ICS9LPR427AGLF (ASUS Eee PC 1000/1001HA/1005PE/1005HA/1018P/1215N/T101MT, Foxconn Qbook)
ICS9LPR427CGLF (ASUS Eee PC T91MT/T91/T91SA/1101HA/1201HA/1201PN)
ICS9LPRS430BGLF (Hannspree HannsBook SN12E2)
ICS9LPRS441AGLF (ASUS AT5NM10-I)
ICS9LPRS471AKL (ECS A770M-A)
ICS9LPRS475BGLF (HP Pavilion P6537C/P6520F)
ICS9LPRS476HKLF (HP Compaq 615, Acer Ferrari One 200) - SetFSB has a problem that WiFi and LAN shut down.
ICS9LPRS477BKL (Asus M3A, DFI LP UT 790FX-M2R)
ICS9LPR501HGLF (ABIT IB9,IP35)
ICS9LPR501SGLF(Toshiba Tecra A9 with the hardware modification)
ICS9LP505-2HGLF (VAIO type R master)
ICS9LPRS509HGLF (DFI Infinity P965-S, Biostar TP35D2-A7, Foxconn P35A, ECS P35T-A V1.0)
ICS9LPRS511EGLF (Foxconn G9657MA-8EKRS2H, Shuttle SP35P2 PRO/X27D Barebone, Supermicro C2SBA)
ICS9LPRS514EGLF (MSI P965 platinum, Foxconn 946GZ7MA-8K2SH)
ICS9LPRS552AGLF (ASUS P5K31-VM/P5B-E/P5B-Plus/P5B[Vanilla], GIGABYTE G33M-DS2R )
ICS9LPRS587AGLF (GIGABYTE GA-965P-DS3)
ICS9LPRS587EGLF (GIGABYTE P35-DS3)
ICS9LPR600CGLF (ASUS X59SR/X71SL/F80CR, LG E500 K.APSAG, MSI CX600, Packard Bell BV GD-T671MG, Acer aspire M1610, Fujitsu-Siemens Esprimo mobile V5155)
ICS9LPR604AGLF (Intel D201GLY)
ICS9LPRS906CGLF (MSI P35 Platinum)
ICS9LPRS910BKL (MSI X38 Diamond)
ICS9LPRS914EKL (Gigabyte X38-DQ6 ,X38T-DQ6, GA-P45-DS3L,GA-EP43 DS3L)
ICS9LPRS916JGLF (ASUS P5K, P5QL Pro )
ICS9LPRS918BKL(ASUS P5K/3 Deluxe, P5E, P5Q Deluxe, P5Q-E, P6T Deluxe)
ICS9LPRS918JKL (DFI LanParty DK X38/X48 T2R, UT X48 T3R, LanParty UT/DK/JR X58)
ICS9LPRS919BKL (Foxconn Mars)
ICS9LPRS926EGLF (ECS P45T-A/X48T-A)
ICS9LPRS929AKLF (ASUS W90/G72GX, MSI Wind U120)
ICS9LPRS954BGLF (ASUS P5KPL-AM/P5G41T-M/CM5570/P5QL-VM-EPU/P7H55-M)
ICS9LR3362CGLF (ASUS UL20A/UL30A/UL30VT/UL50VT/UL80VT)
ICS9UMS9610BL (Sony VAIO P Series/VPC X11S1E, Dell mini 10, Nokia Booklet 3G, Archos 9 PCtablet)
CV110JPVG (Intel Nine Mile D945PLNM, HP Pavilion A1050Y)
CV115CPV (Intel D915PCY)
CV122CPVG (ASUS P5LD2-VM SE)
CV125PAG (FSC Amilo Pro 3505, Acer TravelMate 2428AWXMi)
CV137PAG (FSC Amilo 1650G)
CV152PVG (SuperMicro X7DB8+)
CV174CPAG (Intel DG965LV/DQ965GF/DG965RY/DG965WH/DP965LT/DQ965CO)
CV179CNLG (Samsung NC10/N120/X520)
CV183APAG (Intel DQ35JOE, Dell Optiplex 330)
CV184-2APAG (NEC Express5800 S70 Type FL)
CV190BPAG (ASUS IPIBL-LA[Berkeley])
CV193CPAG (ECS X58B-A, SUN Ultra 24, HP Pavilion P6335FR)
CY28341OC-3 (Biostar M7VIZ)
CY28346ZI-2 (IBM ThinkPad T42 2373-7WG)
CY28349BOC (HP A808.uk)
CY28551LFXC (ASUS P5B-Deluxe/COMMANDO, Intel G35EC)
CY28551LFXC_DFI (DFI LANPARTY UT/LT P35/X38/X48 T2R, DK P35 T2/T2RS, Blood Infinity P35 T2R)
IMIC9827HY (IBM ThinkPad X31 2672CAJ, Acer Aspire 1414, Fujitsu Siemens Scenic i845D)
RTM520-39D (EPoX EP-BX6, Chaintech CT-6ASA4)
RTM580-255R (ABIT KV7)
RTM862-480 (Biostar 945GC-M4)
RTM862-520 (MSI PM8M3-V, BIOSTAR P4M800CE-8237)
RTM865T-300 (Gateway MX3142M/MX3139M, HP Compaq dx2200 MT)
RTM865T-433 (Acer Aspire 4710G)
RTM866-485 (ECS 945GCT-M2)
RTM866-890 (Asrock 4CoreDual-VSTA)
RTM870T-691 (MSI K9AGM3-FIH, Acer Aspire 5054WXMi)
RTM875T-363 (Asus LV50Vn/M50Vn)
RTM875T-587 (Jetway I35P-SG-PB/I35P-SG/BI100-KU, Gigabyte GA-G31MF-S2/G41M-ES2L)
RTM875T-606 (HP DV9500 - Unlock TME)
RTM876-660 (GIGABYTE GA-TG965MP-RH, ASUS P5GC-MX/1333 )
RTM876-665 (MSI 945GCM478)
RTM880T-792 (ASUS K50AF)
RTM880T-794 (MSI WIND U230)
RTM885N-914 (Biostar T-Power X58)
RTM885T-926B (Biostar TPower I55)
SL28541BQC (Samsung R518/R522-FS08)
SLG505YC56DT (Intel D975XBX2/ DQ965COE)
SLG505YC256BT (Intel DG33BU/DX39BT)
SLG505YC264BT (Intel DP35DP)
SLG8SP513V (Samsung R70)
SLG8LP625T (MSI MS-7304[Fujitsu-Siemens Amilo Pa/La-Series])
SLG8SP626V (Acer Ferrari One 200/Aspire 5532, Toshiba T115D-S1125, HP Pavilion DV6-2112SA)
W196G (ABit BH6 rev 1.1)
W83115RG-GS (ASRock ConRoe1333-D667)
W83194BG-SD (ASRock ConRoe865PE)
W83194R-39B (Abit VH6-II)
W83195BR-25 (ONDA ID815EP/T)
W83195BG-101 (ASRock ConRoeXFire-eSATA2)
ASUS G51J/G60JX (ASUS G51J/G60JX)
ASUS N61JQ (ASUS N61JQ/N71JQ/N71JA, DELL Alienware M15x, Acer Aspire 5740/7740, Packard Bell TJ-75) - not working on all hardware.
ASUS G73JH (ASUS N71JV/G73JH/G73JW/G75JH/U45JC/UL30JT/UL80JT, DELL Alienware M17x-R2/M11x-R2, Acer TimelineX 1830T/3820T/4820TG/Aspire 4745G/5745G, Sager NP8120)

Program is now shareware. The last freeware version is also available but does not support many motherboards after late 2009.

Limitations:
As of 2017, this has not been updated and is no longer sold and was released as freeware. Don't let that make it seem like a good idea, however. It's unsupported, unbuyable and not recommended. It's also not for the beginner. You've been warned.