Thank you. That suggestion was extremely helpful. I reduced the AppPool min memory to 40% and DBCC works like a charm now. I'll see if i can leave it at 40 or bump it up a little bit to workout an optimal value for it.

Thanks Again. But do you know why RG doesnt allow the requested memory for DBCC in default pool when i set my Apppool to 70% ? my max memory is 24GB, out of that 70% if i give it to APppool, i still have 7GB. DBCC only requestes 900MB out of 7GB. so technically RG should allocate rather than waiting on memory grants, correct???