RAM speed upgrade? 1333 to 1866 for £30?

[Moholeo]

Is it worth spending £30 for higher Mhz? Is it worth upgrading to 16gb for more?

i5 2500k (@4.2Ghz)
P8P67 mobo
8Gb 1333 Mhz RAM
Asus GTX 770 Directcuii 2Gb

Should I not bother?

 

[Tradesman1]

Depends on what you do with the rig, higher data rate DRAM or more DRAM can be handy especially if using data intensive apps or multi-tasking a fair amount 😉

 

[geofelt]

If your main purpose is gaming and not heavy multitasking, 8gb is fine and not worth replacing.
Sandy bridge does not benefit much from fast ram.
Here is a report on ram speed scaling:
http://www.anandtech.com/show/4503/sandy-bridge-memory-scaling-choosing-the-best-ddr3

On balance, I think more ram trumps faster ram.

Spend your £30 elsewhere.
If you do not already have a ssd, that is a very good performance upgrade. (not for £30 though)