The present disclosure is directed to fast approximate conflict detection. A device may comprise, for example, a memory, a processor and a fast conflict detection module (FCDM) to cause the processor to perform fast conflict detection. The FCDM may cause the processor to read a first and second vector from memory, and to then generate summaries based on the first and second vectors. The summaries may be, for example, shortened versions of write and read addresses in the first and second vectors. The FCDM may then cause the processor to distribute the summaries into first and second summary vectors, and may then determine potential conflicts between the first and second vectors by comparing the first and second summary vectors. The summaries may be distributed into the first and second summary vectors in a manner allowing all of the summaries to be compared to each other in one vector comparison transaction.