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Vicktek's RAF1.28.8655 MIPSR2 K26 on Asus RT-N16: what CPU speed to choose?

Discussion in 'Tomato Firmware' started by premudriy, Dec 30, 2010.

  1. premudriy

    premudriy LI Guru Member

    Hello everybody,

    I just bought Asus RT-N16 router and flashed it with Victek's Tomato RAF1.28.8655 MIPSR2_RAF K26 USB VPN. When I reset memory throughout (i.e. 100% all defaults), then on the "Overview" page it shows CPU speed as:
    Code:
    CPU Frequency (MHz)	480,240,120
    In "Advanced->Miscellaneous" I can see whole bunch of CPU frequencies ranging from 188 to 533. The one selected in the dropdown box is 188.

    Even though I know that CPU in RT-N16 is rated for 533 MHz I'm lost, because with all defaults it shows "480,240,120" and the default frequency in the Misc. page shows 188 Mhz.

    Thus I don't know if it's safe to just choose 533Mhz from the dropdown box. Please, tell me if it's safe to do so and also (if possible) tell why it's "480,240,120" by default. I would hate to kill this thing on its first day.
     
  2. luckman212

    luckman212 LI Guru Member

    same exact question. can anyone confirm the correct setting here for RT-N16?
     
  3. Toastman

    Toastman Super Moderator Staff Member Member

    There is no "correct" setting - only what you prefer, but the safe setting is 480 and is the factory default. The selection "dropdown" box gives a small and adequate selection of frequencies for most routers. But obviously it makes little sense to run them at slower speeds, people generally like to make them go faster :) There's a link below to the full BCM47xx clock table for those who are interested. It is sufficient to just specify the CPU frequency and leave the other two figures (memory clock and backplane) to be set by the router, which will set them at f/2 and f/4.

    The RT-N16 and other routers with the same processor generally leave the factory set to 480MHz, which is odd, considering that the advertising hype stated it used a 533MHz processor. The fact is, when people tried to clock them at the nominal 532 and 533 MHz clocks it was found that they were very unstable at those frequencies. They usually ran for a few minutes before crashing. Now we knew why the manufacturers set them to 480MHz! They clearly had some problem which caused them to downgrade the specification. Some new myths immediately sprang up to explain this, such as overheating, inadequate power supplies, but had little basis in reality.

    So 480MHz was known to be stable. 500MHz generally worked OK too, but 532 was a no-no.

    BUT

    The situation may have changed, because for some reason we don't yet know, recent versions of Teddy Bear's firmware (and thus most other mods using it as a base) appear to be stable at 532 MHz, on exactly the same hardware! Try it and see, it is a reasonable increase in speed (around 10%) if you need it, but be warned - 480MHz is "officially" the one to use. If you notice anything odd happening at 532 - revert to 480. But just for the record, ALL of my RT-N16's can run at 532 MHz and are stable.

    So now the choice is up to you!

    http://www.dd-wrt.com/wiki/index.php/Overclocking_BCM_47xx_CPU's
    http://tomatousb.org/tut:over-clocking-asus-rt-n16

    The link above seems to have stopped working. Here's the list of supported clock frequencies from the source code. You only need to set the first two, but can supply all 3 if you wish.

    • 390 /* cpu, ddr, axi, pllctl12, pllctl13, pllctl14, pllctl15, |pllctl16 */
    • 391 { 66, 66, 66, 0x11100070, 0x00121212, 0x03c00000, 0x20000000, 0 },
    • 392 { 75, 75, 75, 0x11100070, 0x00101010, 0x03c00000, 0x20000000, 0 },
    • 393 { 80, 80, 80, 0x11100070, 0x000a0a0a, 0x02800000, 0x20000000, 0 },
    • 394 { 83, 83, 83, 0x11100070, 0x000c0c0c, 0x03200000, 0x20000000, 0 },
    • 395 { 100, 66, 66, 0x11100070, 0x0012120c, 0x03c00000, 0x30000000, 0 },
    • 396 { 100, 100, 100, 0x11100070, 0x000c0c0c, 0x03c00000, 0x20000000, 0 },
    • 397 { 120, 60, 60, 0x11100070, 0x00101008, 0x03000000, 0x40000000, 0 },
    • 398 { 120, 120, 120, 0x11100070, 0x00080808, 0x03000000, 0x20000000, 0 },
    • 399 { 125, 83, 83, 0x11100070, 0x000c0c08, 0x03200000, 0x30000000, 0 },
    • 400 { 133, 66, 66, 0x11500070, 0x00101008, 0x10a00000, 0x40000000, 4 },
    • 401 { 133, 133, 133, 0x11500070, 0x00080808, 0x10a00000, 0x20000000, 4 },
    • 402 { 148, 148, 74, 0x11100070, 0x00120909, 0x04300000, 0x28000000, 0 },
    • 403 { 150, 75, 75, 0x11100070, 0x00101008, 0x03c00000, 0x40000000, 0 },
    • 404 { 150, 100, 100, 0x11100070, 0x000c0c08, 0x03c00000, 0x30000000, 0 },
    • 405 { 150, 150, 75, 0x11100070, 0x00100808, 0x03c00000, 0x28000000, 0 },
    • 406 { 150, 150, 150, 0x11100070, 0x00080808, 0x03c00000, 0x20000000, 0 },
    • 407 { 155, 155, 77, 0x11100070, 0x00120909, 0x04600000, 0x28000000, 0 },
    • 408 { 155, 155, 155, 0x11100070, 0x00090909, 0x04600000, 0x20000000, 0 },
    • 409 { 166, 83, 83, 0x11100070, 0x000c0c06, 0x03200000, 0x40000000, 0 },
    • 410 { 166, 166, 83, 0x11100070, 0x000c0606, 0x03200000, 0x28000000, 0 },
    • 411 { 166, 166, 166, 0x11100070, 0x00060606, 0x03200000, 0x20000000, 0 },
    • 412 { 200, 200, 100, 0x11100070, 0x000c0606, 0x03c00000, 0x28000000, 0 },
    • 413 { 223, 148, 74, 0x11100070, 0x00120906, 0x04300000, 0x38000000, 0 },
    • 414 { 240, 120, 120, 0x11100070, 0x00080804, 0x03000000, 0x40000000, 0 },
    • 415 { 240, 240, 120, 0x11100070, 0x00080404, 0x03000000, 0x28000000, 0 },
    • 416 { 250, 166, 83, 0x11100070, 0x000c0604, 0x03200000, 0x38000000, 0 },
    • 417 { 250, 166, 166, 0x11100070, 0x00060604, 0x03200000, 0x30000000, 0 },
    • 418 { 266, 133, 133, 0x11500070, 0x00080804, 0x10a00000, 0x40000000, 4 },
    • 419 { 266, 266, 133, 0x11500070, 0x00080404, 0x10a00000, 0x28000000, 4 },
    • 420 { 300, 100, 100, 0x11100070, 0x000c0c04, 0x03c00000, 0x60000000, 0 },
    • 421 { 300, 150, 75, 0x11100070, 0x00100804, 0x03c00000, 0x48000000, 0 },
    • 422 { 300, 150, 150, 0x11100070, 0x00080804, 0x03c00000, 0x40000000, 0 },
    • 423 { 300, 200, 100, 0x11100070, 0x000c0604, 0x03c00000, 0x38000000, 0 },
    • 424 { 320, 213, 106, 0x11100070, 0x000c0604, 0x04000000, 0x38000000, 0 },
    • 425 { 333, 166, 83, 0x11100070, 0x000c0603, 0x03200000, 0x48000000, 0 },
    • 426 { 333, 166, 166, 0x11100070, 0x00060603, 0x03200000, 0x40000000, 0 },
    • 427 { 340, 226, 113, 0x11100070, 0x000c0604, 0x04400000, 0x38000000, 0 },
    • 428 { 354, 177, 88, 0x11500070, 0x000c0603, 0x10a00000, 0x48000000, 4 },
    • 429 { 373, 186, 93, 0x11100070, 0x000c0603, 0x03800000, 0x48000000, 0 },
    • 430 { 400, 133, 133, 0x11100070, 0x000c0c04, 0x05000000, 0x60000000, 0 },
    • 431 { 400, 160, 80, 0x11100070, 0x00140a04, 0x05000000, 0x58000000, 0 },
    • 432 { 400, 160, 160, 0x11100070, 0x000a0a04, 0x05000000, 0x50000000, 0 },
    • 433 { 400, 200, 100, 0x11100070, 0x000c0603, 0x03c00000, 0x48000000, 0 },
    • 434 { 400, 266, 133, 0x11100070, 0x000c0604, 0x05000000, 0x38000000, 0 },
    • 435 { 446, 148, 74, 0x11100070, 0x00120903, 0x04300000, 0x68000000, 0 },
    • 436 { 453, 226, 113, 0x11100070, 0x000c0603, 0x04400000, 0x48000000, 0 }, // patch from BCM
    • 437 { 480, 137, 68, 0x11100070, 0x000e0702, 0x03000000, 0x78000000, 0 },
    • 438 { 480, 137, 137, 0x11100070, 0x00070702, 0x03000000, 0x70000000, 0 },
    • 439 { 480, 160, 80, 0x11100070, 0x000c0602, 0x03000000, 0x68000000, 0 },
    • 440 { 480, 240, 120, 0x11100070, 0x00080402, 0x03000000, 0x48000000, 0 },
    • 441 { 500, 100, 100, 0x11100070, 0x000a0a02, 0x03200000, 0xa0000000, 0 },
    • 442 { 500, 166, 83, 0x11100070, 0x000c0602, 0x03200000, 0x68000000, 0 },
    • 443 { 500, 166, 166, 0x11100070, 0x00060602, 0x03200000, 0x60000000, 0 },
    • 444 { 500, 200, 100, 0x11100070, 0x000a0502, 0x03200000, 0x58000000, 0 },
    • 445 { 500, 250, 125, 0x11100070, 0x00080402, 0x03200000, 0x48000000, 0 },
    • 446 { 532, 133, 133, 0x11500070, 0x00080802, 0x10a00000, 0x80000000, 4 },
    • 447 { 532, 177, 88, 0x11500070, 0x000c0602, 0x10a00000, 0x68000000, 4 },
    • 448 { 532, 177, 177, 0x11500070, 0x00060602, 0x10a00000, 0x60000000, 4 },
    • 449 { 532, 266, 133, 0x11500070, 0x00080402, 0x10a00000, 0x48000000, 4 },
    • 450 {0}
    • 451 };
     
    HitheLightz likes this.
  4. Beast

    Beast Network Guru Member

    Talking about CPU speed,

    Im running Tomato Firmware v1.28.7617 -Toastman-K24 ND USB VPN on my WRTSL54GS.
    This router runs at 264 mhz factory default. But I noticed under Advance/Misc drop down menu for CPU settings, that they are from 188-250. ???? Cant remember for sure but I think some of those choices can brick the router or really make it run really weird.

    Is this a bug or.....

    Beast
     
  5. TexasFlood

    TexasFlood Network Guru Member

    I -think- I saw a mention over on the DD-WRT forums that 300MHz was one of the valid settings. But I have no way to test or verify this so don't try it without independently verifying it yourself. I have no idea if the frequencies on the dropdown are known good ones but I would not assume so without asking, as you have done, :wink:. I would never overclock one of my routers unless i was damn sure either that it was a known good value or that I could recover it if not. I tend to be pretty conservative about this sort of thing but do have one WRT54G-TM overclocked a bit.
     
  6. Toastman

    Toastman Super Moderator Staff Member Member

    The ones I use were selected just for a decently spaced selection of speeds. Normally when you select a frequency that is not in the table, the closest (usually higher) figure is used instead. I avoided 216 MHz because that is known to brick some routers such as GL's - but I don't know of any frequencies that actually brick a GS. If there are any, maybe we should be removing them from the selection.

    Anyone?
     
  7. luckman212

    luckman212 LI Guru Member

    thank you so much for the info!! exactly what I was wanting to know! :)
     
  8. TexasFlood

    TexasFlood Network Guru Member

    FYI, I have an RT-N16 which I set to 532 and it worked. But there were so many reports of instability at the time I didn't think it was worth the risk to leave it there so went back to the default 480 which has been stable and plenty fast for me.
     
  9. Toastman

    Toastman Super Moderator Staff Member Member

    Yes, there were a few people who said theirs worked fine. If you remember, those same people were filling the forums with strange comments on many things going pear shaped, and that the routers were overheating / needed fans / new power supplies etc. One of the routers even died and was replaced under warranty :)

    But soon afterwards, something in the firmware seems to have fixed it.
     
  10. premudriy

    premudriy LI Guru Member

    Hey, everyone, it was a while since I started this thread. Since I didn't get any replies the day after, I decided to risk it and set the CPU to 533.

    Guess what, the router has been running just fine ever since. That was on 12/30/2010 and now it's pretty much has been a full month. No issues, no problems.
     
  11. Elanzer

    Elanzer Addicted to LI Member

    I have been running my RT-N16 at 533mhz for roughly half a year now without any issues. This is with a fair bit of load on the router, as I'm also running a squid cache on it and a few other optware services.

    Granted though I did replace the heatsink in the router with a bigger one, I heard the issues at 533mhz were related to heat. I did run it at 533mhz without any issues with the regular heatsink for a couple weeks without any issue though..
     
  12. pendetim

    pendetim Addicted to LI Member

    I know this is an old thread but if anyone is still watching: I have two RT-16Ns running v1.28.7483 MIPSR2-Toastman-RT K26 USB VPN.

    If I set the CPU speed to "default" it is showing 133 MHz in the Status tab. Is this correct? I would think the speed would be the factory speed of 480 MHz.
     
  13. Toastman

    Toastman Super Moderator Staff Member Member

    Set it to 480,240 using the menu on Advanced/Misc page.

    Elanzer's post, yes, the old heat myth was nonsense. Every new router is accused of overheating every time someone can't explain a problem with the firmware :) It's very rare for a router manufacturer to screw this up these days.
     
  14. pendetim

    pendetim Addicted to LI Member

    s
    s
    Thanks, done.
     

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