Testing more than 4GB in v6.1.0

[Moridin]

While running Memtest86 v6.1.0 I am able to test 4GB out of the 6GB in my laptop. Memtest86 sees all 6GB of RAM, and allows me to set an address range of 0GB to 4GB. However, anything over 4096MB as part of the address range causes the test bar to not reach 100% and lock up. Is there a setting that I am missing either in Memtest86 or BIOS that needs to be configured to have it run in 64bit? I am running Memtest86 using UEFI with a bootable USB. I can not attach the files for the tests I ran, so I will paste the results below.

Report Date 2015-06-11 04:40:09
Generated by MemTest86 V6.1.0 Free (64-bit)
Result PASS
System Information


EFI Specifications 2.00
CPU Type Intel Core i7 Q 720 @ 1.60GHz
CPU Clock 1596 MHz [Turbo: 1729.0 MHz]
# Logical Processors 8 (1 enabled for testing)
L1 Cache 4 x 64K (31895 MB/s)
L2 Cache 4 x 256K (17485 MB/s)
L3 Cache 6144K (15237 MB/s)
Memory 6403M (8963 MB/s)
DIMM Slot #0 2GB DDR3 PC3-10600
Kingston / ASU1333D3S9DR8/2G
9-9-9-24 / 666 MHz / 1.5V
DIMM Slot #1 2GB DDR3 PC3-10600
Kingston / ASU1333D3S9DR8/2G
9-9-9-24 / 666 MHz / 1.5V
DIMM Slot #2 2GB DDR3 PC3-10600
Kingston / ASU1333D3S9DR8/2G
9-9-9-24 / 666 MHz / 1.5V
Result summary


Test Start Time 2015-06-10 19:18:09
Elapsed Time 3:33:18
Memory Range Tested 0x40000000 - 100000000 (3072MB)
CPU Selection Mode Single: CPU # 0
# Tests Passed 48/48 (100%)
Test # Tests Passed Errors
Test 0 [Address test, walking ones, 1 CPU] 4/4 (100%) 0
Test 1 [Address test, own address, 1 CPU] 4/4 (100%) 0
Test 2 [Address test, own address] 4/4 (100%) 0
Test 3 [Moving inversions, ones & zeroes] 4/4 (100%) 0
Test 4 [Moving inversions, 8-bit pattern] 4/4 (100%) 0
Test 5 [Moving inversions, random pattern] 4/4 (100%) 0
Test 6 [Block move, 64-byte blocks] 4/4 (100%) 0
Test 7 [Moving inversions, 32-bit pattern] 4/4 (100%) 0
Test 8 [Random number sequence] 4/4 (100%) 0
Test 9 [Modulo 20, ones & zeros] 4/4 (100%) 0
Test 10 [Bit fade test, 2 patterns, 1 CPU] 4/4 (100%) 0
Test 13 [Hammer test] 4/4 (100%) 0

[keith]

Thanks for the details. We have received your e-mailed as well, and requested additional information.

The report indicates that you are running in 64-bit, so I suspect it may be a UEFI BIOS firmware issue with allocating memory above 4GB. So I would first check for a BIOS update.