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Adjusting the Maximum Backside Cache
Speed
Backside cache is the revolutionary new technology that places
Level 2 cache (high speed memory) directly on the CPU card, ded-
icated to the G3 CPU.
Since this is a dedicated cache technology, on its own BUS, it is
not limited to the slower fixed speed (±50 MHz) of the main logic
board BUS. The backside cache can run at speeds up the speed of
the CPU itself.
Most often though, the backside cache operates at half the speed
of the CPU. Even this speed is nearly 4 times faster than earlier in-
line, and look-aside caching technologies.
The Speed of the Cache is derived from the Ratios of the set
operating speed of the CPU. For example, if the CPU runs at 400
MHz, and the backside cache Ratio is 2:1, then the backside cache
will run at 200 MHz
To adjust the Backside Cache Speed:
1. Open the MACh Speed G3 Control in your Control Panels
folder.
Opening the G3 Control
Chapter 4 - Advanced Perf o rmance Tu n i n g
Page 5 7
MACh Speed G3 Model: Default Setting
220MHz / 110MHz 2:1
233MHz / 117MHz 2:1
266MHz / 177MHz 1.5:1
266MHz / 133MHz 2:1
275MHz / 183MHz 1.5:1
275MHz / 137MHz 2:1
300MHz / 120MHz 5:2
300MHz / 200MHz 2:1
333MHz / 166MHz 2:1
366MHz / 183MHz 2:1
400MHz / 200MHz 2:1
MVP CPU Frequency Chart
Chapter 4 - Advanced Perf o rmance Tu n i n g
Page 5 6
Switches in
12 11 10,11 10 10,12 9,11,12 10,11,12 9,10
“ON” position
Bus Ratio
4.5 5 5.5 6 6.5 7 7.5 8
1,3,4,6 40.0 180.0 200.0 220.0 240.0 260.0 280.0 300.0 320.0
1,2,3,6 40.6 182.7 203.0 223.3 243.6 263.9 284.2 304.5 324.8
6,8 41.0 1487.2 208.0 228.8 249.6 270.4 291.2 312.0 332.8
2,4,6,8 42.0 189.0 210.0 231.0 252.0 273.0 294.0 315.0 336.0
1,6,8 42.6 191.7 213.0 234.3 255.6 276.9 298.2 319.5 340.8
1,3,6,8 43.0 193.5 215.0 236.5 258.0 279.5 301.0 322.5 344.0
1,2,4,6,8 43.6 196.2 218.0 239.8 261.6 283.4 305.2 327.0 348.8
1,2,3,4,6,8 44.0 198.0 220.0 242.0 264.0 286.0 308.0 330.0 352.0
3,6,7 44.6 200.7 223.0 245.3 267.6 289.9 312.2 334.5 356.8
2,6,7 45.0 202.5 225.0 247.5 270.0 292.5 315.0 337.5 360.0
2,3,4,6,7 45.6 205.2 228.0 250.8 273.6 296.4 319.2 342.0 364.8
1,4,6,7 46.0 207.0 230.0 253.0 276.0 299.0 322.0 345.0 368.0
1,2,6,7 46.6 209.7 233.0 256.3 279.6 302.9 326.2 349.5 372.8
1,2,3,6,7 47.0 211.5 235.0 258.5 282.0 305.5 329.0 352.5 376.0
4,6,7,8 47.6 214.2 238.0 261.8 285.6 309.4 332.2 357.0 380.8
3,4,6,7,8 48.0 216.0 240.0 264.0 288.0 312.0 336.0 360.0 384.0
2,3,6,7,8 48.6 218.7 243.0 267.3 291.6 315.9 340.2 364.5 388.8
1,6,7,8 49.0 220.5 245.0 269.5 294.0 318.5 343.0 367.5 392.0
1,3,4,6,7,8 49.6 223.2 248.0 272.8 297.6 322.4 347.2 372.0 396.8
1,2,4,6,7,8 50.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0
5 50.6 227.7 253.0 278.3 303.6 328.9 354.2 379.5 404.8
3,5 51.0 229.5 255.0 280.5 306.0 331.5 357.0 382.5 408.0
2,4,5 51.6 232.2 258.0 283.8 309.6 335.4 361.2 387.0 412.8
2,3,4,5 52.0 234.0 260.0 286.0 312.0 338.0 364.0 390.0 416.0
1,3,5 52.6 236.7 263.0 289.3 315.6 341.9 368.2 394.5 420.8
1,2,5 53.0 238.5 265.0 291.5 318.0 344.5 371.0 397.5 424.0
1,2,3,4,5 53.6 241.2 268.0 294.8 321.6 348.4 375.2 402.0 428.8
4,5,8 54.0 243.0 270.0 297.0 324.0 351.0 378.0 405.0 432.0
2,5,8 54.6 245.7 273.0 300.3 327.6 354.9 382.2 409.5 436.8
2,3,5,8 55.0 247.5 275.0 302.5 330.0 357.5 385.0 412.5 440.0
1,4,5,8 55.6 250.2 278.0 305.8 333.6 361.4 389.2 417.0 444.8
1,3,4,5,8 56.0 252.0 280.0 308.0 336.0 364.0 392.0 420.0 448.0
1,2,3,5,8 56.6 254.7 283.0 311.3 339.6 367.9 396.2 424.5 452.8
5,7 57.0 256.5 285.0 313.5 342.0 370.5 399.0 427.5 456.0
3,4,5,7 57.6 259.2 288.0 316.8 345.6 374.4 403.2 432.0 460.8
2,4,5,7 58.0 261.0 290.0 319.0 348.0 377.0 406.0 435.0 464.0
1,5,7 58.6 263.7 293.0 322.3 351.6 380.9 410.2 439.5 468.8
1,3,5,7 59.0 265.5 295.0 342.5 354.0 383.5 413.0 442.5 472.0
1,2,4,5,7 59.6 268.2 298.0 327.8 357.6 387.4 417.2 447.0 476.8
1,2,3,4,5,7 60.0 270.0 300.0 330.0 360.0 390.0 420.0 450.0 480.0
Base Settings Switches in the “ON” position Bus Speed Bus ratio
2 2 0 1,3,4,6 - 10,11 4 0 . 0 5.5 to 1
2 3 3 1,6,8 - 10,11 4 2 . 6 5.5 to 1
2 6 6 6,8 - 10,12 4 1 . 0 6.5 to 1
2 7 5 1,6,8 - 10,12 4 2 . 6 6.5 to 1
3 0 0 1,3,4,6 - 10,11,12 4 0 . 0 7.5 to 1
3 3 3 3,4,6,8 - 9,10 4 4 . 6 7.5 to 1
3 6 6 1,4,6,7 - 9,10 4 6 . 0 8.0 to 1
4 0 0 1,2,4,6,7,8 - 9,10 5 0 . 0 8.0 to 1