I am getting quite different picture:

	int bsize=8*1024*1024;
	Buffer<dword> b(bsize, 0);
	dword cw = 123;

	String result="\"N\",\"memsetd()\",\"Fill3T3()\"\r\n";
	for(int len=1;len<=bsize;){
		int maximum=100000000/len;
		int64 t0=usecs();
		for(int i = 0; i < maximum; i++)
			memsetd(~b, cw, len);
		int64 t1=usecs();
		for(int i = 0; i < maximum; i++)
			Fill3T3(~b, cw, len);
		int64 t2=usecs();
		String r = Format("%d,%f,%f",len,1000.0*(t1-t0)/maximum,1000.0*(t2-t1)/maximum);
		RLOG(r);
		result.Cat(r + "\r\n");
		if(len<64) len++;
		else len*=2;
	}
	
	SaveFile(GetHomeDirFile("memset.csv"),result);

I am starting to wonder if there is difference between our MSC 32bit compilers...

Microsoft (R) C/C++ Optimizing Compiler Version 19.21.27702.2 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.