Many a times there are needs to figure out if really there are instances where SQL Server components were raising Out-Of-Memory conditions. A quick way to keep track of this is to track the ring_buffers table. Typically you will use something like this:
6: ring_buffer_type = 'RING_BUFFER_OOM'
Obviously a row here means you do have memory pressures that were being forced. For some explanation on the various values ring_buffers might send, see this blog post from PSS which gives you some starters. I highly recommend reading this whitepaper in your leisure for Performance Troubleshooting which also talks about some of the cool things ring_buffers expose when you start working with SQL Server.
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