2Gb and 4Gb debug log extracts, "initially-printed" memory usage and memory dump later.

2Gb case:

(ntoskrnl\kd\kdio.c:454) -----------------------------------------------------
(ntoskrnl\kd\kdio.c:455) ReactOS 0.4-SVN (Build 20110329-r51193)
(ntoskrnl\kd\kdio.c:457) 1 System Processor [2048 MB Memory]
(ntoskrnl\kd\kdio.c:458) Command Line: /DEBUG /DEBUGPORT=SCREEN /DEBUGPORT=COM1 /SOS /MININT /FIRSTCHANCE
(ntoskrnl\kd\kdio.c:462) ARC Paths: multi(0)disk(0)cdrom(31) \ multi(0)disk(0)cdrom(31) \reactos\
(ntoskrnl\mm\mminit.c:243)           0x80000000 - 0x81000000    Boot Loaded Image
(ntoskrnl\mm\mminit.c:247)           0xB0000000 - 0xB0BFF000    PFN Database
(ntoskrnl\mm\mminit.c:251)           0xB0BFF000 - 0xB4BAF000    ARMᨠNon Paged Pool
(ntoskrnl\mm\mminit.c:255)           0xBC000000 - 0xBD000000    System View Space
(ntoskrnl\mm\mminit.c:259)           0xBD000000 - 0xC0000000    Session Space
(ntoskrnl\mm\mminit.c:262)           0xC0000000 - 0xC0300000    Page Tables
(ntoskrnl\mm\mminit.c:265)           0xC0300000 - 0xC0400000    Page Directories
(ntoskrnl\mm\mminit.c:268)           0xC0400000 - 0xC0800000    Hyperspace
(ntoskrnl\mm\mminit.c:272)           0xE1000000 - 0xF2400000    ARMᨠPaged Pool
(ntoskrnl\mm\mminit.c:275)           0xF2400000 - 0xF7BE0000    System PTE Space
(ntoskrnl\mm\mminit.c:278)           0xF7BE0000 - 0xFFBE0000    Non Paged Pool Expansion PTE Space
(hal\halx86\generic\legacy\bussupp.c:591) Your machine has a PCI-to-PCI or CardBUS Bridge. PCI devices may fail!
(hal\halx86\generic\legacy\bussupp.c:620) Found parent bus (indicating PCI Bridge). PCI devices may fail!
 <...>
(ntoskrnl\mm\ARM3\sysldr.c:168) Loading: \SystemRoot\system32\drivers\afd.sys at FF5E0000 with 26 pages
(ntoskrnl\mm\ARM3\mminit.c:1805) Base           Length          Type
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000000       00000001        FirmwarePermanent
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000001       00000007        FirmwareTemporary
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000008       00000070        LoadedProgram   
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000078       00000008        SpecialMemory   
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000080       00000020        FirmwareTemporary
(ntoskrnl\mm\ARM3\mminit.c:1811) 000000A0       00000060        FirmwarePermanent
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000100       00000001        OsloaderHeap    
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000101       00000020        RegistryData    
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000121       000000C7        HalCode         
(ntoskrnl\mm\ARM3\mminit.c:1811) 000001E8       00000009        BootDriver      
(ntoskrnl\mm\ARM3\mminit.c:1811) 000001F1       0000000E        HalCode         
(ntoskrnl\mm\ARM3\mminit.c:1811) 000001FF       00000400        OsloaderHeap    
(ntoskrnl\mm\ARM3\mminit.c:1811) 000005FF       00000024        NlsData         
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000623       00000061        BootDriver      
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000684       0000001A        HalCode         
(ntoskrnl\mm\ARM3\mminit.c:1811) 0000069E       000000CA        BootDriver      
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000768       00000002        StartupPcrPage  
(ntoskrnl\mm\ARM3\mminit.c:1811) 0000076A       00000004        MemoryData      
(ntoskrnl\mm\ARM3\mminit.c:1811) 0000076E       00000092        Free            
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000800       00000375        SystemCode      
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000B75       00000201        MemoryData            
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000D76       000001FF        FirmwareTemporary            
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000F75       0000008A        Free            
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000FFF       00000001        SpecialMemory   
(ntoskrnl\mm\ARM3\mminit.c:1811) 00001000       0007EECF        Free            
(ntoskrnl\mm\ARM3\mminit.c:1815) Total: 0007FECF (2046 MB)
(ntoskrnl\ex\init.c:1918) Free non-cache pages: 797cd
(./base/system/smss/initwkdll.c:195) NtOpenFile failed (Status c000003a)
****

4Gb case:

(ntoskrnl\kd\kdio.c:454) -----------------------------------------------------
(ntoskrnl\kd\kdio.c:455) ReactOS 0.4-SVN (Build 20110329-r51193)
(ntoskrnl\kd\kdio.c:457) 1 System Processor [25 MB Memory]
(ntoskrnl\kd\kdio.c:458) Command Line: /DEBUG /DEBUGPORT=SCREEN /DEBUGPORT=COM1 /SOS /MININT /FIRSTCHANCE
(ntoskrnl\kd\kdio.c:462) ARC Paths: multi(0)disk(0)cdrom(31) \ multi(0)disk(0)cdrom(31) \reactos\
(ntoskrnl\mm\mminit.c:243)           0x80000000 - 0x81C00000    Boot Loaded Image
(ntoskrnl\mm\mminit.c:247)           0xB0000000 - 0xB0028000    PFN Database
(ntoskrnl\mm\mminit.c:251)           0xB0028000 - 0xB0228000    ARMᨠNon Paged Pool
(ntoskrnl\mm\mminit.c:255)           0xBC000000 - 0xBD000000    System View Space
(ntoskrnl\mm\mminit.c:259)           0xBD000000 - 0xC0000000    Session Space
(ntoskrnl\mm\mminit.c:262)           0xC0000000 - 0xC0300000    Page Tables
(ntoskrnl\mm\mminit.c:265)           0xC0300000 - 0xC0400000    Page Directories
(ntoskrnl\mm\mminit.c:268)           0xC0400000 - 0xC0800000    Hyperspace
(ntoskrnl\mm\mminit.c:272)           0xE1000000 - 0xE3000000    ARMᨠPaged Pool
(ntoskrnl\mm\mminit.c:275)           0xFCC00000 - 0xFFA61000    System PTE Space
(ntoskrnl\mm\mminit.c:278)           0xFFA61000 - 0xFFBE0000    Non Paged Pool Expansion PTE Space
(hal\halx86\generic\legacy\bussupp.c:591) Your machine has a PCI-to-PCI or CardBUS Bridge. PCI devices may fail!
(hal\halx86\generic\legacy\bussupp.c:620) Found parent bus (indicating PCI Bridge). PCI devices may fail!
 <...>
(ntoskrnl\mm\ARM3\sysldr.c:168) Loading: \SystemRoot\system32\drivers\afd.sys at FF5E0000 with 26 pages
(ntoskrnl\mm\ARM3\mminit.c:1805) Base           Length          Type
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000000       00000001        FirmwarePermanent
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000001       00000007        FirmwareTemporary
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000008       00000070        LoadedProgram   
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000078       00000008        SpecialMemory   
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000080       00000020        FirmwareTemporary
(ntoskrnl\mm\ARM3\mminit.c:1811) 000000A0       00000060        FirmwarePermanent
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000100       00000001        OsloaderHeap    
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000101       00000020        RegistryData    
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000121       000000C7        HalCode         
(ntoskrnl\mm\ARM3\mminit.c:1811) 000001E8       00000009        BootDriver      
(ntoskrnl\mm\ARM3\mminit.c:1811) 000001F1       0000000E        HalCode         
(ntoskrnl\mm\ARM3\mminit.c:1811) 000001FF       00000400        OsloaderHeap    
(ntoskrnl\mm\ARM3\mminit.c:1811) 000005FF       00000024        NlsData         
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000623       00000061        BootDriver      
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000684       0000001A        HalCode         
(ntoskrnl\mm\ARM3\mminit.c:1811) 0000069E       000000CA        BootDriver      
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000768       00000002        StartupPcrPage  
(ntoskrnl\mm\ARM3\mminit.c:1811) 0000076A       00000004        MemoryData      
(ntoskrnl\mm\ARM3\mminit.c:1811) 0000076E       00000092        Free            
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000800       00000375        SystemCode      
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000B75       0000048A        Free            
(ntoskrnl\mm\ARM3\mminit.c:1811) 00000FFF       00000001        SpecialMemory   
(ntoskrnl\mm\ARM3\mminit.c:1811) 00001000       00000502        MemoryData      
(ntoskrnl\mm\ARM3\mminit.c:1811) 00001502       00000500        FirmwareTemporary            
(ntoskrnl\mm\ARM3\mminit.c:1815) Total: 00001A02 (26 MB)
(ntoskrnl\ex\init.c:1918) Free non-cache pages: 59A
(./base/system/smss/initwkdll.c:195) NtOpenFile failed (Status c000003a)
****