There's a limit?
1 Subject to a maximum Additional Bonus Interest payable on the first S$100,000 in Top-up Amount(s) across all 3 Relevant Months.
http://www.hsbc.com.sg/1/2/hsbcpremier/welcome-rewards/preferential-rates
a bit complicated in actual situations, with 3 rates applied across different period and given out different times.
1. prevailing: <0.1% in tiers. the more u put, the nearer to 0.1
2. step up: 1.8% on total balance
3. card spend: 0.7% on 100k (spend 500)
4. gifts etc (but didnt use to calculate the below)
potentially, if 100k, u can hit 2.6%
but u need 200k to be premier customer, 1.8+(0.7/2)=2.15
i'm getting average 1.95 - 2%, so that is better than esaver 1.7
rest i put in uob1 (2.43) and ocbc 360 (2.25 average)