Stopwatch on Interlocked.Increment(ref x) vs. lock (y) { x++; }

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Given 10 million iterations:

 object y = new object();
const int iterations = 10000000;

Which is faster, InterlockedIncrement:

 stopWatch = Stopwatch.StartNew();
for (int i = 0; i < iterations; i++)
{
    Interlocked.Increment(ref x);
}
stopWatch.Stop();
Console.WriteLine("Interlocked took " + stopWatch.ElapsedMilliseconds);

Or lock:

 stopWatch = Stopwatch.StartNew();
for (int i = 0; i < iterations; i++)
{
    lock (y)
    {
        x++;
    }
}
stopWatch.Stop();
Console.WriteLine("lock took " + stopWatch.ElapsedMilliseconds);

The answer surprised me:

Interlocked took 168

lock took 389

Best,

Brian