This table’s Axe-Fx III data was compiled by Fractal Forum user DLC86. Thanks!

Below is a table comparing the FM3 and Axe-Fx III CPU usage of each block. There are a few things to keep in mind:

  • These values are only estimates.
  • The CPU meter changes quickly, so all % are within +/- 0.1% or so.
  • These values were calculated with no audio running through the Axe-Fx III and no USB cable connected. Real-time audio and processing does increase CPU a bit.
  • Values are calculated using the hardware CPU meter, not Axe-Edit III.
  • All blocks are at Default Values for each type, unless noted in the Details column – endless combinations of values could change the CPU level.
  • Approximate “CPU Limit” per preset is 90%.

As mentioned, these are just estimates. Adding numbers together that may work based off this sheet may not work on the actual unit by a few % due to many factors of running real-time processing. Some numbers move extremely quickly, so “best guess” is used at times. Again, just estimates for a general idea of CPU usage.

Forum User DLC86 compiled the Axe-Fx III data and included a few extra lines compared to our FM3 chart. We’ve removed those items from the Axe-Fx III chart, but kept them here in this comparison.

Of course keep in mind that the FM3 is an all-in-one processor with foot controller, so the CPU is known to not be the same as the much more powerful Axe-Fx III. This comparison is just for convenience and curiosity as it is requested often.

CPU usage subject to change when firmware is updated

Click here to see the FM3 Chart

Click here to see the Axe-Fx III Chart


BlockDetailsFM3 1.02Axe FX III 12.06
Base CPU11.64.7
Shunt0.20.2
InputNo Gate (Threshold: Off)2.00.6
Classic Gate3.61.4
Intelligent Gate4.81.9
Noise Reducer4.81.9
Out20.8
Amp1.90.4
Cab
High-Res1 Cab3.66.6
2 Cabs3.812.4
3 Cabs--18.2
4 Cabs--24.0
Ultrares1 Cab--5.4
2 Cabs--9.9
3 Cabs--14.4
4 Cabs--18.7
PreampAll types, Economy0.6
All types, High quality2.7
RoomDiffusion On2.5
Diffusion Off1.4
ChorusDigital Mono5.92.9
Digital Stereo5.93
Analog Mono6.73.2
Analog Stereo6.73.3
Japan CE-26.73.2
Warm Stereo6.53.2
80's Style5.82.9
Triangle Chorus5.72.8
8-Voice Stereo10.85.9
Vintage Tape6.33.7
Dimension 16.13.1
Dimension 26.33.1
Dimension 36.33.1
4-Voice Analog8.13.3
8-Voice Analog11.66.4
Stereo Tri-Chorus5.52.8
Dual Chorus4.62.2
CompStudio Comp42.1
Pedal Comp 12.51
Pedal Comp 22.91.3
Dynamics Processor31.6
Optical Comp3.11.4
Tube Comp3.31.5
Analog Comp3.61.9
DynamiComp2.61
Crossover--1.8
DelayDigital Mono1.92.6
Digital Stereo1.92.7
Analog Mono23.3
Analog Stereo23.4
Mono Tape23.6
Stereo Tape24
Ping-Pong1.93.5
Dual Delay1.93.5
Reverse Delay1.91.7
Sweep Delay1.94.5
Ducking Delay1.93.6
Vintage Ditigal1.93.5
2290 w/ Mod1.93.4
Ambient Stereo1.95.1
Deluxe Mind Guy1.93.3
Mono BBD1.93.2
Stereo BBD1.93.3
Lo-Fi Tape1.93.7
Stereo Mind Guy23.3
DriveBB Pre8.96
Bender Fuzz5.52.8
Bit Crusher6.34
Blackglass 7K5.83.9
Blues OD8.86
Esoteric ACB8.96
Esoteric RCB8.96
Eternal Love8.86
FAS Boost8.96
FAS LED-Drive8.76
FET Boost5.62.8
FET Preamp5.62.8
Face Fuzz6.24
Fat Rat8.96.1
Full OD8.76
Hard Fuzz5.42.7
Heartpedal 118.86
Jam Ray8.86
M-Zone Distortion9.36.2
Master Fuzz6.34
Micro Boost5.72.8
Mid Boost6.34
OD 2508.96
Octave Distortion5.62.9
PI Fuzz6.34
Plus Distortion8.96
Rat Distortion8.96
Ruckus Ge8.96.1
Ruckus LED8.96.1
Ruckus LED/Si8.96.1
SDD Preamp5.72.7
Shimmer Drive6.44
Shred Distortion8.96
Super OD8.86
T808 Mod8.86
T808 OD8.86
Tape Distortion6.13.9
Timothy 18.76
Timothy 28.76
Tone of Kings8.76
Treble Boost6.13.9
Tube Drive 3-Knob5.83.4
Tube Drive 4-Knob5.83.5
Zen Master8.86
EnhancerModern3.61.2
Classic2.30.6
Stereoizer3.40.9
FilterAll types except...2.30.6
FF Comb3.10.8
FB Comb3.10.9
Allpass2.30.9
FlangerDigital Mono5.22.1
Digital Stereo5.32.2
Analog Mono5.42.2
Analog Stereo5.52.3
Thru-Zero62.4
Stereo Jet5.32.2
Zero Flanger5.42.2
Pop Flanger62.4
MXF-1177.82.9
BBF-27.82.9
Electric Mystery6.62.5
Deluxe Mystery6.42.4
D/AD 1857.52.8
Manual Thru-Zero Flanger5.42.2
Step Flanger6.32.5
FAS Flanger5.32.2
Formant2.40.8
GateClassic2.10.7
Downward Expander2.91.4
GEQAll Types1.70.5
IR PlayerHigh-Res--6.3
Ultrares--5.1
LooperSpeed Full4.55.7
Speed Half54.1
Megatap1 Tap4.11.3
10 Taps6.32.3
25 Taps9.83.9
45 Taps14.76.4
64 Taps19.48.6
MIDI0.20.2
Mixer1.60.5
Multiband Comp11.64.3
Multiplexer1.91
Multitap DelayQuad-Tap6.73.1
Quad Parallel8.83.9
Quad Series7.63.4
Diffusor6.32.7
Quad Tape9.35.4
Quad-Tap Band6.83.1
PEQ2.20.8
PhaserDigital Mono3.11.6
Digital Stereo3.11.6
Script 452.51.2
Script 9031.5
Block 9031.5
Classic Vibe3.31.9
Stereo 8-Stage4.32.2
Barber Pole9.65.6 - 6.2
Stripe 903.11.5
Naughty Rock3.71.9
FAS Vibe3.42
Treadle Phaser3.51.8
Virtuoso Phaser3.51.8
Borg Phaser3.11.5
Ultra-Super-Mega Phaser5.12.8
Mutated Twin-Phaser3.61.8
PitchDual Detune8.93.4
Quad Detune14.65.8
Dual Shift9.85
Quad Shift169
Dual Harmony10.35.3
Quad Harmony16.89.5
Classic Whammy7.33.2
Octave Divider4.71.9
Crystal Echoes7.53.6
Advanced Whammy6.63.1
Arpeggiator6.63.2
Custom Shifter10.55.2
Quad Shift Delay16.48.1
Quad Harmony Delay17.39.6
Virtual Capo6.63.2
Plex DelayPlex Delay9.83.2
Plex Detune15.76.7
Plex Shift15.66.7
Plex Verb13.54.4
Shimmer Verb27.513.5
RTA--0.2
Resonator7.54
Return Block1.70.6
Reverb
Normal, Echo Density: 8Ambience23.57.2
Asylum Hall267.7
Cavern25.77.6
Chorus Hall267.7
Cirrocumulus267.7
Concert Hall267.7
Cumulonimbus267.7
Deep Chamber267.7
Deep Space267.7
Deluxe Spring Verb--6
Drum Room25.77.6
Gymnasium267.7
Hallway25.47.6
Huge Room267.7
Ice Castle267.7
Large Cathedral267.7
Large Chamber267.7
Large Deep Hall267.7
Large Hall267.7
Large Plate267.7
Large Room267.7
Large Spring17.75.9
Large Tiled Room24.17.2
Large Wooden Room267.7
London Plate25.77.7
Medium Cathedral267.7
Medium Chamber24.17.2
Medium Hall267.7
Medium Plate25.47.7
Medium Room25.77.7
Medium Spring17.56
Music Hall267.7
Nimbostratus267.7
North Church267.7
Recording Studio A24.17.2
Recording Studio C24.17.2
Rich Hall267.7
Small Cathedral25.77.6
Small Chamber267.7
Small Hall267.7
Small Plate25.17.7
Small Room23.77.3
Small Spring15.55.4
South Church267.7
Stone Quarry25.77.6
Stratocumulus267.7
Studio23.47.2
Sun Plate25.77.7
Symphony Hall267.7
Tunnel25.77.7
Vocal Plate267.7
Wide Hall267.7
High, Echo Density 8Ambience31.910
Asylum Hall34.510.5
Cavern34.110.5
Chorus Hall34.510.5
Cirrocumulus34.510.5
Concert Hall34.510.5
Cumulonimbus34.510.5
Deep Chamber34.510.5
Deep Space34.510.5
Deluxe Spring Verb--6
Drum Room34.110.5
Gymnasium34.510.5
Hallway33.710.5
Huge Room34.510.5
Ice Castle34.510.5
Large Cathedral34.510.5
Large Chamber34.510.5
Large Deep Hall34.510.5
Large Hall34.510.5
Large Plate34.510.5
Large Room34.510.5
Large Spring17.75.9
Large Tiled Room32.310
Large Wooden Room34.510.5
London Plate34.110.5
Medium Cathedral34.510.5
Medium Chamber32.310
Medium Hall34.510.5
Medium Plate33.710.5
Medium Room34.110.5
Medium Spring17.56
Music Hall34.510.6
Nimbostratus34.510.5
North Church34.510.5
Recording Studio A32.310
Recording Studio C32.310
Rich Hall34.510.6
Small Cathedral34.110.5
Small Chamber34.510.5
Small Hall34.510.5
Small Plate33.410.4
Small Room32.110.1
Small Spring15.55.4
South Church34.510.5
Stone Quarry34.110.4
Stratocumulus34.510.6
Studio32.110
Sun Plate34.110.5
Symphony Hall34.510.4
Tunnel34.110.6
Vocal Plate34.510.5
Wide Hall34.510.6
Ultra High, Echo Density 8Ambience--11
Asylum Hall--11.5
Cavern--11.5
Chorus Hall--11.5
Cirrocumulus--11.6
Concert Hall--11.6
Cumulonimbus--11.5
Deep Chamber--11.6
Deep Space--11.5
Deluxe Spring Verb--6
Drum Room--11.6
Gymnasium--11.5
Hallway--11.5
Huge Room--11.5
Ice Castle--11.5
Large Cathedral--11.5
Large Chamber--11.5
Large Deep Hall--11.5
Large Hall--11.5
Large Plate--11.5
Large Room--11.5
Large Spring--5.9
Large Tiled Room--11
Large Wooden Room--11.5
London Plate--11.5
Medium Cathedral--11.5
Medium Chamber--11.1
Medium Hall--11.5
Medium Plate--11.5
Medium Room--11.5
Medium Spring--6
Music Hall--11.6
Nimbostratus--11.5
North Church--11.5
Recording Studio A--11.1
Recording Studio C--11.1
Rich Hall--11.6
Small Cathedral--11.5
Small Chamber--11.6
Small Hall--11.6
Small Plate--11.5
Small Room--11
Small Spring--5.4
South Church--11.6
Stone Quarry--11.5
Stratocumulus--11.6
Studio--11
Sun Plate--11.5
Symphony Hall--11.5
Tunnel--11.6
Vocal Plate--11.5
Wide Hall--11.6
Ring ModClassic2.92.3
SSB Upper5.22.9
SSB Lower5.22.9
Rotary6.63.3
Send Block0.10.2
Synth1 Voice Triangle7.83.3
2 Voices Triangle135
3 Voices Triangle186.7
Ten-Tap DelayTen Tap Mono4.82.5
Rhythm Tap Mono4.92.5
Ten Tap Stereo7.63.2
Rhythm Tap Stereo7.83.3
Tonematch--7
TremoloTremolo2.90.6
Panner52.3
Bias Trem30.6
Harmonic Trem4.51
Optical Trem--0.7
Vocoder--8.1
VolumeVolume2.10.6
Auto-Swell2.50.7
WahAll types3.11.1