diff --git a/rpcs3/Emu/Cell/PPUThread.cpp b/rpcs3/Emu/Cell/PPUThread.cpp
index ec45306220..1784b58b6a 100644
--- a/rpcs3/Emu/Cell/PPUThread.cpp
+++ b/rpcs3/Emu/Cell/PPUThread.cpp
@@ -1137,14 +1137,9 @@ extern bool ppu_stwcx(ppu_thread& ppu, u32 addr, u32 reg_value)
 
 		auto& res = vm::reservation_acquire(addr, sizeof(u32));
 
-		const auto [_, ok] = res.fetch_op([&](u64& reserv)
-		{
-			return (++reserv & -128) == ppu.rtime;
-		});
-
 		ppu.raddr = 0;
 
-		if (ok)
+		if (res == ppu.rtime && res.compare_and_swap_test(ppu.rtime, ppu.rtime | 1))
 		{
 			if (data.compare_and_swap_test(old_data, reg_value))
 			{
@@ -1258,14 +1253,9 @@ extern bool ppu_stdcx(ppu_thread& ppu, u32 addr, u64 reg_value)
 
 		auto& res = vm::reservation_acquire(addr, sizeof(u64));
 
-		const auto [_, ok] = res.fetch_op([&](u64& reserv)
-		{
-			return (++reserv & -128) == ppu.rtime;
-		});
-
 		ppu.raddr = 0;
 
-		if (ok)
+		if (res == ppu.rtime && res.compare_and_swap_test(ppu.rtime, ppu.rtime | 1))
 		{
 			if (data.compare_and_swap_test(old_data, reg_value))
 			{
diff --git a/rpcs3/Emu/Cell/SPUThread.cpp b/rpcs3/Emu/Cell/SPUThread.cpp
index de3a01261d..50963f9ecd 100644
--- a/rpcs3/Emu/Cell/SPUThread.cpp
+++ b/rpcs3/Emu/Cell/SPUThread.cpp
@@ -349,7 +349,6 @@ const auto spu_putllc_tx = build_function_asm<u32(*)(u32 raddr, u64 rtime, const
 	c.bind(fall);
 	c.sar(x86::eax, 24);
 	c.js(fail);
-	c.lock().add(x86::qword_ptr(x86::rbx), 1);
 	c.lock().bts(x86::dword_ptr(args[2], ::offset32(&spu_thread::state) - ::offset32(&spu_thread::rdata)), static_cast<u32>(cpu_flag::wait));
 
 	// Touch memory if transaction failed without RETRY flag on the first attempt
@@ -364,6 +363,13 @@ const auto spu_putllc_tx = build_function_asm<u32(*)(u32 raddr, u64 rtime, const
 
 	// Lightened transaction: only compare and swap data
 	c.bind(next);
+
+	// Try to "lock" reservation
+	c.mov(x86::rax, x86::r13);
+	c.add(x86::r13, 1);
+	c.lock().cmpxchg(x86::qword_ptr(x86::rbx), x86::r13);
+	c.jne(fail);
+
 	build_transaction_enter(c, fall2, x86::r12, 666);
 
 	if (s_tsx_avx)
@@ -848,7 +854,6 @@ const auto spu_putlluc_tx = build_function_asm<u32(*)(u32 raddr, const void* rda
 	//c.jmp(fall);
 
 	c.bind(fall);
-	c.lock().add(x86::qword_ptr(x86::rbx), 1);
 	c.lock().bts(x86::dword_ptr(args[2], ::offset32(&spu_thread::state)), static_cast<u32>(cpu_flag::wait));
 
 	// Touch memory if transaction failed without RETRY flag on the first attempt
@@ -859,9 +864,15 @@ const auto spu_putlluc_tx = build_function_asm<u32(*)(u32 raddr, const void* rda
 	c.xor_(x86::rbp, 0xf80);
 
 	Label fall2 = c.newLabel();
+	Label fail2 = c.newLabel();
 
 	// Lightened transaction
 	c.bind(next);
+
+	// Try to acquire "PUTLLUC lock"
+	c.lock().bts(x86::qword_ptr(x86::rbx), 6);
+	c.jc(fail2);
+
 	build_transaction_enter(c, fall2, x86::r12, 666);
 
 	if (s_tsx_avx)
@@ -884,10 +895,14 @@ const auto spu_putlluc_tx = build_function_asm<u32(*)(u32 raddr, const void* rda
 	}
 
 	c.xend();
-	c.lock().add(x86::qword_ptr(x86::rbx), 127);
+	c.lock().add(x86::qword_ptr(x86::rbx), 64);
 	c.mov(x86::eax, 1);
 	c.jmp(_ret);
 
+	c.bind(fail2);
+	c.xor_(x86::eax, x86::eax);
+	c.jmp(_ret);
+
 	c.bind(fall2);
 	c.mov(x86::eax, 2);
 	//c.jmp(_ret);
@@ -1617,24 +1632,16 @@ void spu_thread::do_putlluc(const spu_mfc_cmd& args)
 		{
 			cpu_thread::suspend_all cpu_lock(this);
 
-			// Try to obtain bit 7 (+64)
-			if (!vm::reservation_acquire(addr, 128).bts(6))
+			if (vm::reservation_acquire(addr, 128) & 64)
 			{
-				auto& data = vm::_ref<decltype(rdata)>(addr);
-				mov_rdata(data, to_write);
-
-				// Keep checking written data against a rogue transaction sneak in
-				while (std::atomic_thread_fence(std::memory_order_seq_cst), !cmp_rdata(data, to_write))
+				// Wait for PUTLLC to complete
+				while (vm::reservation_acquire(addr, 128) & 1)
 				{
-					mov_rdata(data, to_write);
+					busy_wait(100);
 				}
 
-				vm::reservation_acquire(addr, 128) += 63;
-			}
-			else
-			{
-				// Give up if another PUTLLUC command took precedence
-				vm::reservation_acquire(addr, 128) -= 1;
+				mov_rdata(vm::_ref<decltype(rdata)>(addr), to_write);
+				vm::reservation_acquire(addr, 128) += 64;
 			}
 		}
 	}
@@ -1921,8 +1928,8 @@ bool spu_thread::process_mfc_cmd()
 
 					cpu_thread::suspend_all cpu_lock(this);
 
-					// Give up if other PUTLLC/PUTLLUC commands are in progress
-					if (!vm::reservation_acquire(addr, 128).try_dec(rtime + 1))
+					// Give up if PUTLLUC happened
+					if (vm::reservation_acquire(addr, 128) == (rtime | 1))
 					{
 						auto& data = vm::_ref<decltype(rdata)>(addr);
 
@@ -1937,6 +1944,10 @@ bool spu_thread::process_mfc_cmd()
 							vm::reservation_acquire(addr, 128) -= 1;
 						}
 					}
+					else
+					{
+						vm::reservation_acquire(addr, 128) -= 1;
+					}
 				}
 			}
 			else if (auto& data = vm::_ref<decltype(rdata)>(addr); rtime == (vm::reservation_acquire(raddr, 128) & -128) && cmp_rdata(rdata, data))