diff --git a/test/mockgpu/usb.py b/test/mockgpu/usb.py
index a7fba8790c..460b46100e 100644
--- a/test/mockgpu/usb.py
+++ b/test/mockgpu/usb.py
@@ -5,7 +5,7 @@ class MockUSB:
   def read(self, address, size):
     return bytes(self.mem[address:address+size])
 
-  def write(self, address, data):
+  def write(self, address, data, ignore_cache=False):
     self.mem[address:address+len(data)] = data
 
   def pcie_mem_req(self, address, value=None, size=1):
diff --git a/test/test_hcq_iface.py b/test/test_hcq_iface.py
index 2a3e0974cb..bf32bf637c 100644
--- a/test/test_hcq_iface.py
+++ b/test/test_hcq_iface.py
@@ -62,7 +62,7 @@ class TestUSBMMIOInterface(unittest.TestCase):
 
   def test_getitem_setitem_byte(self):
     self.mmio[1] = 0xAB
-    self.assertEqual(self.mmio[1], bytes([0xAB]))
+    self.assertEqual(self.mmio[1], 0xAB)
     self.assertEqual(self.usb.mem[1], 0xAB)
 
   def test_slice_getitem_setitem(self):
@@ -76,13 +76,13 @@ class TestUSBMMIOInterface(unittest.TestCase):
   def test_view(self):
     self.mmio[0] = 5
     view = self.mmio.view(offset=1, size=3)
-    self.assertEqual(view[0], bytes([self.usb.mem[1]]))
+    self.assertEqual(view[0], self.usb.mem[1])
     view[:] = [7, 8, 9]
     self.assertEqual(list(self.usb.mem[1:4]), [7, 8, 9])
     full_view = self.mmio.view()
     self.assertEqual(len(full_view), len(self.mmio))
     self.mmio[2] = 0xFE
-    self.assertEqual(full_view[2], bytes([0xFE]))
+    self.assertEqual(full_view[2], 0xFE)
 
   def test_pcimem_byte(self):
     usb2 = MockUSB(bytearray(self.size))
diff --git a/tinygrad/runtime/support/usb.py b/tinygrad/runtime/support/usb.py
index 83c6f6b9de..0df50515e3 100644
--- a/tinygrad/runtime/support/usb.py
+++ b/tinygrad/runtime/support/usb.py
@@ -231,7 +231,8 @@ class USBMMIOInterface(MMIOInterface):
 
   def _acc(self, off, sz, data=None):
     if data is None: # read op
-      if not self.pcimem: return self.usb.read(self.addr + off, sz)
+      if not self.pcimem:
+        return int.from_bytes(self.usb.read(self.addr + off, sz), "little") if sz == self.el_sz else self.usb.read(self.addr + off, sz)
 
       acc, acc_size = self._acc_size(sz)
       return bytes(array.array(acc, [self._acc_one(off + i * acc_size, acc_size) for i in range(sz // acc_size)]))
@@ -240,7 +241,8 @@ class USBMMIOInterface(MMIOInterface):
 
       if not self.pcimem:
         # Fast path for writing into buffer 0xf000
-        return self.usb.scsi_write(bytes(data)) if self.addr == 0xf000 else self.usb.write(self.addr + off, bytes(data))
+        use_cache = 0xa000 <= self.addr <= 0xb200
+        return self.usb.scsi_write(bytes(data)) if self.addr == 0xf000 else self.usb.write(self.addr + off, bytes(data), ignore_cache=not use_cache)
 
       _, acc_sz = self._acc_size(len(data) * struct.calcsize(self.fmt))
       self.usb.pcie_mem_write(self.addr+off, [int.from_bytes(data[i:i+acc_sz], "little") for i in range(0, len(data), acc_sz)], acc_sz)