diff --git a/src/backend/core/mmio/SI.cpp b/src/backend/core/mmio/SI.cpp
index fbd01424..8d8866ba 100644
--- a/src/backend/core/mmio/SI.cpp
+++ b/src/backend/core/mmio/SI.cpp
@@ -38,12 +38,20 @@ void SI::DMA() {
   if (toDram) {
     pif.ProcessCommands(mem);
     for(int i = 0; i < 64; i++) {
-      mem.mmio.rdp.rdram[BYTE_ADDRESS(dramAddr + i)] = pif.Read(pifAddr + i);
+      u32 addr = dramAddr + i;
+      if(addr < RDRAM_SIZE) {
+        mem.mmio.rdp.rdram[BYTE_ADDRESS(addr)] = pif.Read(pifAddr + i);
+      }
     }
     Util::trace("SI DMA from PIF RAM to RDRAM ({:08X} to {:08X})", pifAddr, dramAddr);
   } else {
     for(int i = 0; i < 64; i++) {
-      pif.Write(pifAddr + i, mem.mmio.rdp.rdram[BYTE_ADDRESS(dramAddr + i)]);
+      u32 addr = dramAddr + i;
+      if(addr < RDRAM_SIZE) {
+        pif.Write(pifAddr + i, mem.mmio.rdp.rdram[BYTE_ADDRESS(addr)]);
+      } else {
+        pif.Write(pifAddr + i, 0);
+      }
     }
     Util::trace("SI DMA from RDRAM to PIF RAM ({:08X} to {:08X})", dramAddr, pifAddr);
     pif.ProcessCommands(mem);
@@ -75,4 +83,4 @@ void SI::Write(u32 addr, u32 val) {
       Util::panic("Unhandled SI[{:08X}] write ({:08X})", addr, val);
   }
 }
-}
\ No newline at end of file
+}