diff --git a/src/xenia/base/string_buffer.cc b/src/xenia/base/string_buffer.cc
index 025c9b2e0..f512161f2 100644
--- a/src/xenia/base/string_buffer.cc
+++ b/src/xenia/base/string_buffer.cc
@@ -101,5 +101,73 @@ std::vector<uint8_t> StringBuffer::to_bytes() const {
   std::memcpy(bytes.data(), buffer_, buffer_offset_);
   return bytes;
 }
+#if XE_ARCH_AMD64 == 1
+static __m128i ToHexUpper(__m128i value) {
+  __m128i w = _mm_cvtepu8_epi16(value);
 
+  __m128i msk =
+      _mm_and_si128(_mm_or_si128(_mm_srli_epi16(w, 4), _mm_bslli_si128(w, 1)),
+                    _mm_set1_epi16(0x0F0F));
+
+  __m128i conv =
+      _mm_shuffle_epi8(_mm_setr_epi8('0', '1', '2', '3', '4', '5', '6', '7',
+                                     '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'),
+                       msk);
+  return conv;
+}
+#endif
+
+void StringBuffer::AppendHexUInt64(uint64_t value) {
+#if XE_ARCH_AMD64 == 1
+  __m128i conv = ToHexUpper(_mm_cvtsi64_si128(static_cast<long long>(value)));
+
+  AppendBytes(reinterpret_cast<const uint8_t*>(&conv), 16);
+#else
+  AppendFormat("{:016X}", value);
+#endif
+}
+
+void StringBuffer::AppendHexUInt32(uint32_t value) {
+#if XE_ARCH_AMD64 == 1
+  __m128i conv = ToHexUpper(_mm_cvtsi32_si128(static_cast<int>(value)));
+
+  uint64_t low = _mm_cvtsi128_si64(conv);
+
+  AppendBytes(reinterpret_cast<const uint8_t*>(&low), 8);
+#else
+  AppendFormat("{:08X}", value);
+#endif
+}
+
+void StringBuffer::AppendParenthesizedHexUInt32(uint32_t value) {
+#if XE_ARCH_AMD64 == 1
+  Grow(10);
+
+  buffer_[buffer_offset_] = '(';
+  *reinterpret_cast<long long*>(&buffer_[buffer_offset_ + 1]) =
+      _mm_cvtsi128_si64(ToHexUpper(_mm_cvtsi32_si128(value)));
+  buffer_[buffer_offset_ + 9] = ')';
+  buffer_offset_ += 10;
+  buffer_[buffer_offset_] = 0;
+#else
+  AppendFormat("({:08X})", value);
+#endif
+}
+
+void StringBuffer::AppendParenthesizedHexUInt64(uint64_t value) {
+#if XE_ARCH_AMD64 == 1
+  Grow(18);
+
+  buffer_[buffer_offset_] = '(';
+  __m128i conv = ToHexUpper(_mm_cvtsi64_si128(static_cast<long long>(value)));
+  _mm_storeu_si128(reinterpret_cast<__m128i*>(&buffer_[buffer_offset_ + 1]),
+                   conv);
+
+  buffer_[buffer_offset_ + 17] = ')';
+  buffer_offset_ += 18;
+  buffer_[buffer_offset_] = 0;
+#else
+  AppendFormat("({:016X})", value);
+#endif
+}
 }  // namespace xe
diff --git a/src/xenia/base/string_buffer.h b/src/xenia/base/string_buffer.h
index 9a4743deb..ac3050cb7 100644
--- a/src/xenia/base/string_buffer.h
+++ b/src/xenia/base/string_buffer.h
@@ -38,7 +38,10 @@ class StringBuffer {
     auto s = fmt::format(fmt::runtime(format), args...);
     Append(s.c_str());
   }
-
+  void AppendHexUInt64(uint64_t value);
+  void AppendHexUInt32(uint32_t value);
+  void AppendParenthesizedHexUInt32(uint32_t value);
+  void AppendParenthesizedHexUInt64(uint64_t value);
   void AppendVarargs(const char* format, va_list args);
   void AppendBytes(const uint8_t* buffer, size_t length);
 
diff --git a/src/xenia/kernel/util/shim_utils.h b/src/xenia/kernel/util/shim_utils.h
index babd68c9a..396d4863d 100644
--- a/src/xenia/kernel/util/shim_utils.h
+++ b/src/xenia/kernel/util/shim_utils.h
@@ -409,10 +409,10 @@ inline void AppendParam(StringBuffer* string_buffer, word_t param) {
   string_buffer->AppendFormat("{:04X}", uint16_t(param));
 }
 inline void AppendParam(StringBuffer* string_buffer, dword_t param) {
-  string_buffer->AppendFormat("{:08X}", uint32_t(param));
+  string_buffer->AppendHexUInt32(uint32_t(param));
 }
 inline void AppendParam(StringBuffer* string_buffer, qword_t param) {
-  string_buffer->AppendFormat("{:016X}", uint64_t(param));
+  string_buffer->AppendHexUInt64(uint64_t(param));
 }
 inline void AppendParam(StringBuffer* string_buffer, float_t param) {
   string_buffer->AppendFormat("{:G}", static_cast<float>(param));
@@ -421,28 +421,28 @@ inline void AppendParam(StringBuffer* string_buffer, double_t param) {
   string_buffer->AppendFormat("{:G}", static_cast<double>(param));
 }
 inline void AppendParam(StringBuffer* string_buffer, lpvoid_t param) {
-  string_buffer->AppendFormat("{:08X}", uint32_t(param));
+  string_buffer->AppendHexUInt32(uint32_t(param));
 }
 inline void AppendParam(StringBuffer* string_buffer, lpdword_t param) {
-  string_buffer->AppendFormat("{:08X}", param.guest_address());
+  string_buffer->AppendHexUInt32(param.guest_address());
   if (param) {
-    string_buffer->AppendFormat("({:08X})", param.value());
+    string_buffer->AppendParenthesizedHexUInt32(param.value());
   }
 }
 inline void AppendParam(StringBuffer* string_buffer, lpqword_t param) {
-  string_buffer->AppendFormat("{:08X}", param.guest_address());
+  string_buffer->AppendHexUInt32(param.guest_address());
   if (param) {
-    string_buffer->AppendFormat("({:016X})", param.value());
+    string_buffer->AppendParenthesizedHexUInt64(param.value());
   }
 }
 inline void AppendParam(StringBuffer* string_buffer, lpfloat_t param) {
-  string_buffer->AppendFormat("{:08X}", param.guest_address());
+  string_buffer->AppendHexUInt32(param.guest_address());
   if (param) {
     string_buffer->AppendFormat("({:G})", param.value());
   }
 }
 inline void AppendParam(StringBuffer* string_buffer, lpdouble_t param) {
-  string_buffer->AppendFormat("{:08X}", param.guest_address());
+  string_buffer->AppendHexUInt32(param.guest_address());
   if (param) {
     string_buffer->AppendFormat("({:G})", param.value());
   }
@@ -451,20 +451,20 @@ inline void AppendParam(StringBuffer* string_buffer, ppc_context_t param) {
   string_buffer->Append("ContextArg");
 }
 inline void AppendParam(StringBuffer* string_buffer, lpstring_t param) {
-  string_buffer->AppendFormat("{:08X}", param.guest_address());
+  string_buffer->AppendHexUInt32(param.guest_address());
   if (param) {
     string_buffer->AppendFormat("({})", param.value());
   }
 }
 inline void AppendParam(StringBuffer* string_buffer, lpu16string_t param) {
-  string_buffer->AppendFormat("{:08X}", param.guest_address());
+  string_buffer->AppendHexUInt32(param.guest_address());
   if (param) {
     string_buffer->AppendFormat("({})", xe::to_utf8(param.value()));
   }
 }
 inline void AppendParam(StringBuffer* string_buffer,
                         pointer_t<X_OBJECT_ATTRIBUTES> record) {
-  string_buffer->AppendFormat("{:08X}", record.guest_address());
+  string_buffer->AppendHexUInt32(record.guest_address());
   if (record) {
     auto name_string =
         kernel_memory()->TranslateVirtual<X_ANSI_STRING*>(record->name_ptr);
@@ -490,7 +490,7 @@ inline void AppendParam(StringBuffer* string_buffer,
 }
 template <typename T>
 void AppendParam(StringBuffer* string_buffer, pointer_t<T> param) {
-  string_buffer->AppendFormat("{:08X}", param.guest_address());
+  string_buffer->AppendHexUInt32(param.guest_address());
 }
 
 enum class KernelModuleId {