This is called the round-up trick. Found by our accountant friend back in April.
It can only be done for banks (like GX Bank) which pay daily interests and offer multiple saving pockets, and we seek to double the interest paid to each pocket (+ 1 main account) by rounding up 0.005 MYR in interests to 0.01 MYR.

Normally, the formula for daily interest paid is principal * interest rate / number of days in a year. GX Bank uses ACT/ACT convention (actual number of days in a month, actual number of days in a year), and this year there are 366 days.

So to know the exact amount to deposit we work backwards.

0.005 = principal * (2%) / 366 days. Upon rearranging, we get principal = 0.005*366/2% = 91.50 MYR

What this means is that without rounding, if you deposit 91.50 MYR into each saving pocket + main account from 1st October onwards, GX Bank would have paid you 0.005 MYR interest per day. But because the system has to round up 0.005 to 0.01 MYR, that means with 91.50 MYR principal you earn 0.01 MYR instead of 0.005 MYR in interests (the interest rate effectively doubled from 2% to 4%).

You can verify the maths: interest rate = daily interest * number of days in a year / principal = 0.01*366/91.50 = 4% p.a.

91.50 MYR is per saving pocket/main account. GX Bank allows for a total of 10 saving pockets + 1 main account = 11 accounts/pockets in total. So, to earn the full 4% p.a. rate, you deposit 91.50 into all 10 pockets and the main account for a total of 1006.50 MYR. The saving pocket is just something originally intended to segregate your money for different purposes like marriage, car, holidays etc. (mental accounting...) but now we abuse it for an entirely different purpose.   

Hope that helps.

Yes as said earlier you can do so. Basically the effective interest rate will drop from 6% p.a. to 3% p.a. as the remaining total account balance (main + 10 saving pockets) increase from 671 MYR onwards.

Here's a plot that shows you how the rate drops.

[attachmentid=11501751]

The plot is actually misleading because what we care about is the marginal rate of return. The first 671 MYR earns 0.11 which means a 6% p.a. rate. But the next 1342 MYR earns the same 0.11 MYR (which equals a return of 0.11*366/1342 = 3% p.a. marginal return). That's why only the first 671 MYR should stay in GX Bank really...

In economics, you think at the margin.

But alas, you just want a simple solution, so just spread your money among GX Bank, AEON Bank and Rize. That should do the job.