rb750 400MHz

Hardware MikroTik hardware general
1

Do rb750 works with 400HMz cpu clock?

[admin@rb750] > system routerboard settings set cpu-frequency=
250MHz 270MHz 290MHz 300MHz

[admin@rb750] > system routerboard settings set cpu-frequency=400MHz
input does not match any value of cpu-frequency



[admin@rb750] > system resource print
uptime: 1m56s
version: “3.30”
free-memory: 19452kB
total-memory: 29952kB
cpu: “MIPS 24K V7.4”
cpu-count: 1
cpu-frequency: 300MHz
cpu-load: 14
free-hdd-space: 37828kB
total-hdd-space: 61440kB
write-sect-since-reboot: 143
write-sect-total: 84967
bad-blocks: 2
architecture-name: “mipsbe”
board-name: “RB750”
[admin@rb750] > system routerboard print
routerboard: yes
model: “750”
serial-number: “219801874899”
current-firmware: “2.22”
upgrade-firmware: “2.22”

Is there any way to overclock it?

2

some RB750 don’t have 400MHz, but most of them do, and it’s their default.

There should be not much difference, so don’t worry about it.

3

Well i tried using it with l2tp and i don’t get as much performance as i want.
You mean there are two tipes of chips, one’s that can wortk at 400 and others that can’t? Or is this software feature?

4

aparently the 400MHz version would be very similar in this case. yes, it’s a hardware limitation, some devices have this.

5

How can i see if there is 400MHz version, or slower?
I want to test difference myself.

6

the same way you wrote in the first post. check what frequencies are available. if you want to buy a new one, just ask the seller - they know about it.

7

RB750 are being made with CPUs that are at least 300MHz. The very first shipments were made with 400MHz CPUs. At $39 both are an excellent value.

If you need more speed, get the RB450 or better yet RB450G.

The design of these products allows better throughput even if they were set to the same CPU clock.

Tom

8

Isn’t the 400 MHz cpu 33% faster than 300 MHz one? I would pay more for 33% performance. Do anyone has any benchmarks?

9

Yes the 400MHz CPU might be 33% faster but the CPU might not be the bottleneck. It depends on the operations that you are doing. Just curious… would you pay 33% more for the faster CPU?

Tom

10

no, it’s not 33% faster. it’s a number that’s 33% larger than 300 :slight_smile:

you should know by now, that CPU frequencies don’t increase speed linearly.

11

400MHz version would be roughly 30% faster in CPU intensive tasks like IPSEC, L7 filter, etc.

It’s good to know what’s inside.

12

30% more efficient? Not true.

Read this post:
http://forum.mikrotik.com/t/rb750-400mhz/32203/10

13

CPU’s of the same family scale almost linearly (as long as memory can keep up). Saying that 400MHz is almost like 300MHz is like saying that 32MB is the same as 64MB. If you don’t need it you’ll not miss it. Argument put forth is that RB750 is fine with either speed for what it is marketed for - it does not mean there’s no difference.

14

We test it. Trust me, I KNOW I’m right :smiley:

15

Just curious… would you pay 33% more for the faster CPU?

No. Because the cpu is something like 10-20% of price. So i would pay 5% more.

We test it. Trust me, I KNOW I’m right

So whats the difference? Can you post pps test that you do with all routerboards?

16

PPS is the same because it hits wire speed limit for middle to big packet sizes.

17

As i see here, it only hits with 1500 packet size.

18

Dude, just ask your distributor to give you the 400MHz version and test yourself if you don’t believe me!

The Newsletter had incorrect data, thanks for finding that. It was copied from an older test.

19

Ok. But i don’w know if they want to test every unit, and then find out that none of them has that speed :smiley:

20

they were informed, they clearly know which ones have which speed.