diff --git a/src/xenia/base/clock_posix.cc b/src/xenia/base/clock_posix.cc
index f18082b0e..73a23dc76 100644
--- a/src/xenia/base/clock_posix.cc
+++ b/src/xenia/base/clock_posix.cc
@@ -2,45 +2,55 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2019 Ben Vanik. All rights reserved.                             *
+ * Copyright 2021 Ben Vanik. All rights reserved.                             *
  * Released under the BSD license - see LICENSE in the root for more details. *
  ******************************************************************************
  */
 
-#include "xenia/base/clock.h"
-
 #include <sys/time.h>
-#include <time.h>
+
+#include "xenia/base/assert.h"
+#include "xenia/base/clock.h"
 
 namespace xe {
 
 uint64_t Clock::host_tick_frequency_platform() {
   timespec res;
-  clock_getres(CLOCK_MONOTONIC_RAW, &res);
+  int error = clock_getres(CLOCK_MONOTONIC_RAW, &res);
+  assert_zero(error);
+  assert_zero(res.tv_sec);  // Sub second resolution is required.
 
-  return uint64_t(res.tv_sec) + uint64_t(res.tv_nsec) * 1000000000ull;
+  // Convert nano seconds to hertz. Resolution is 1ns on most systems.
+  return 1000000000ull / res.tv_nsec;
 }
 
 uint64_t Clock::host_tick_count_platform() {
-  timespec res;
-  clock_gettime(CLOCK_MONOTONIC_RAW, &res);
+  timespec tp;
+  int error = clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
+  assert_zero(error);
 
-  return uint64_t(res.tv_sec) + uint64_t(res.tv_nsec) * 1000000000ull;
+  return tp.tv_nsec + tp.tv_sec * 1000000000ull;
 }
 
 uint64_t Clock::QueryHostSystemTime() {
-  struct timeval tv;
-  gettimeofday(&tv, NULL);
+  // https://docs.microsoft.com/en-us/windows/win32/sysinfo/converting-a-time-t-value-to-a-file-time
+  constexpr uint64_t seconds_per_day = 3600 * 24;
+  // Don't forget the 89 leap days.
+  constexpr uint64_t seconds_1601_to_1970 =
+      ((369 * 365 + 89) * seconds_per_day);
 
-  uint64_t ret = tv.tv_usec;
-  ret /= 1000;  // usec -> msec
+  timeval now;
+  int error = gettimeofday(&now, nullptr);
+  assert_zero(error);
 
-  ret += (tv.tv_sec * 1000);  // sec -> msec
-  return ret;
+  // NT systems use 100ns intervals.
+  return static_cast<uint64_t>(
+      (static_cast<int64_t>(now.tv_sec) + seconds_1601_to_1970) * 10000000ull +
+      now.tv_usec * 10);
 }
 
 uint64_t Clock::QueryHostUptimeMillis() {
   return host_tick_count_platform() * 1000 / host_tick_frequency_platform();
 }
 
-}  // namespace xe
\ No newline at end of file
+}  // namespace xe
diff --git a/src/xenia/gpu/render_target_cache.cc b/src/xenia/gpu/render_target_cache.cc
index ec83cc4fd..76a3a2ef8 100644
--- a/src/xenia/gpu/render_target_cache.cc
+++ b/src/xenia/gpu/render_target_cache.cc
@@ -845,7 +845,9 @@ RenderTargetCache::GetConfigDepthFloat24Conversion() {
 
 uint32_t RenderTargetCache::GetRenderTargetHeight(
     uint32_t pitch_tiles_at_32bpp, xenos::MsaaSamples msaa_samples) const {
-  assert_not_zero(pitch_tiles_at_32bpp);
+  if (!pitch_tiles_at_32bpp) {
+    return 0;
+  }
   // Down to the end of EDRAM.
   uint32_t tile_rows = (xenos::kEdramTileCount + (pitch_tiles_at_32bpp - 1)) /
                        pitch_tiles_at_32bpp;
diff --git a/src/xenia/gpu/render_target_cache.h b/src/xenia/gpu/render_target_cache.h
index 383c12f94..a3d580356 100644
--- a/src/xenia/gpu/render_target_cache.h
+++ b/src/xenia/gpu/render_target_cache.h
@@ -265,11 +265,15 @@ class RenderTargetCache {
     uint32_t GetPitchTiles() const {
       return pitch_tiles_at_32bpp << uint32_t(Is64bpp());
     }
-    uint32_t GetWidth() const {
+    static constexpr uint32_t GetWidth(uint32_t pitch_tiles_at_32bpp,
+                                       xenos::MsaaSamples msaa_samples) {
       return pitch_tiles_at_32bpp *
              (xenos::kEdramTileWidthSamples >>
               uint32_t(msaa_samples >= xenos::MsaaSamples::k4X));
     }
+    uint32_t GetWidth() const {
+      return GetWidth(pitch_tiles_at_32bpp, msaa_samples);
+    }
 
     std::string GetDebugName() const {
       return fmt::format(