The Bank of Ireland is on the verge of awarding a seven-year $600m (£380m) IT outsourcing contract to Hewlett-Packard.
The deal is the largest IT contract signed in Ireland to date.
"HP is our preferred supplier and we're now in negotiation with them. We would expect it to take four to six months before the contract is signed," Bank of Ireland communications manager Anne Mathews said.
"We had an exhaustive tendering process and they came out on top," she said. The decision was mostly based on price and cost savings.
HP's services division will manage the bank's desktops, midrange servers, mainframes, networks and printing systems, as well as providing some customer support and integration help.
"It's all back-office stuff, only covering part of our IT services and so there are no issues regarding confidentiality (of customer data)," Mathews said.
The bank and HP have agreed to share any savings made as a result of lower operating costs.
About 500 Bank of Ireland employees will be transferred to HP.
HP currently supplies the Bank of Ireland with desktops, servers and storage systems, plus some support services.