Rapid improvements in technology efficiency had driven faster than expected savings at Suncorp following the purchase of Promina last year, chief information officer Jeff Smith said.
Mr Smith said the company's original target of $225 million savings after three years would now be achieved in just two.
Westpac Banking Corporation is facing an information systems integration bill of more than $220 million but would shave at least $43 million a year off its computing and communication costs under its proposed $18.6 billion acquisition of St George Bank.
The bill could rise even higher if Westpac used the integration as an excuse to replace its ageing core business systems, but broad similarities between the acquirer's computer platforms and its target's could also dull some of the potential for pain in the merger.
ASB has appointed Russell Jones as the bank's head of group technology.
Jones has worked for paper company Sappi in both South Africa and Europe, as well as Carter Holt Harvey in New Zealand and International Paper in the US.
Consolidating the complex information systems that drive Westpac's and St George's operations is likely to provide the ripest targets for cost savings.
But industry experts cautioned that any integration of the banks' computing platforms would be expensive and carry many risks.
Australia and New Zealand Banking Group unveiled a complete refit of its ageing website at the weekend as it took the first step in a plan to revolutionise the way it deals with customers online.
The site has been expanded to take up more space on larger, modern-day computer screens, as well as drastically streamlined and simplified.