Filling an array with a default value

After following the discussion on Stackoverflow about how to initialize a byte array with a value I decided to do some benchmarking for fun.

Here are the results, and the code follows below (run on Windows 7 64bit dual core).

Array length: 1048576
Iterations: 1000
Enumerable: 00:00:12.3817249
Parallel Enumerable: 00:00:17.6506353
For loop: 00:00:01.7095341
Parallel for loop: 00:00:06.9824434
Unsafe: 00:00:00.7028914

static void Fill1(byte value)
{
    byte[] a = Enumerable.Repeat<byte>(value, _arrLength).ToArray();
}

static void Fill2(byte value)
{
    byte[] a = ParallelEnumerable.Repeat<byte>(value, _arrLength).ToArray();
}

static void Fill3(byte value)
{
    byte[] a = new byte[_arrLength];
    for (int i = 0; i < _arrLength; i++)
    {
        a[i] = value;
    }
}

static void Fill4(byte value)
{
    byte[] a = new byte[_arrLength];
    Parallel.For(0, _arrLength, i =>
    {
        a[i] = value;
    });
}

static unsafe void Fill5(byte value)
{
    Int64 fillValue = BitConverter.ToInt64(new byte[] { value, value, value, value, value, value, value, value }, 0);

    byte[] a = new byte[_arrLength];
    Int64* src = (Int64*)&fillValue;
    fixed (byte* ptr = &a[0])
    {
        Int64* dest = (Int64*)ptr;
        int length = _arrLength;
        while (length >= 8)
        {                    
            *dest = fillValue;
            dest++;
            length -= 8;
        }
        byte* bDest = (byte*)dest;
        for (byte i = 0; i < length; i++)
        {
            *bDest = value;
            bDest++;
        }
    }
}