If you're raising the BCLK then your RAM will speed up. If you just raise the CPU multiplier which you should be able to do on the K series CPU then just the CPU will speed up.
I will give you couple examples. It's from older systems. But the overclock allows them to still be relvant.
LGA775 QX9650 unlocked CPU In a Dell T3400 workstation.
Q9650 at base clock CPU score 41%
https://www.userbenchmark.com/UserRun/8219338
QX9650 @ 4.15GHz OC CPU score 57% which is above average. The RAM timing hasn't changed.
https://www.userbenchmark.com/UserRun/3530803
Dell T 3500 X58 workstation with unlocked XeonCPU.
W3690 base clock CPU score 67%
https://www.userbenchmark.com/UserRun/4361813
W3680 with OC probably 4.3Ghz ( OC in Windows)CPU score 82%
https://www.userbenchmark.com/UserRun/11469193
These are all locked BIOS mother boards with unlocked CPUs. They're all 8-10 years old and still kicking.
The DDR2 RAM in the T3400 is pretty ancient. But the X58 systems had 3 channel DDR3 1333 which can still keep up.