diff -Naur xfce4-taskmanager-1.0.0-orig/src/main.c xfce4-taskmanager-1.0.0/src/main.c
--- xfce4-taskmanager-1.0.0-orig/src/main.c	2010-06-10 02:52:32.000000000 +0200
+++ xfce4-taskmanager-1.0.0/src/main.c	2013-06-20 19:17:38.977462245 +0200
@@ -83,12 +83,31 @@
 init_timeout (void)
 {
 	guint num_processes;
-	gfloat cpu, memory, swap;
-	guint64 swap_free, swap_total;
-	gchar tooltip[1024];
+	gfloat cpu, memory_percent, swap_percent;
+	guint64 swap_used, swap_free, swap_total, memory_used, memory_total;
+	gchar tooltip[1024], memory_info[64], swap_info[64], used[64], total[64];
+	gboolean show_memory_in_xbytes;
+
+	xtm_task_manager_get_system_info (task_manager, &num_processes, &cpu, &memory_used, &memory_total, &swap_used, &swap_total);
+
+	memory_percent = (memory_total != 0) ? memory_used * 100 / (gdouble)memory_total : 0;
+
+	g_object_get (settings, "show-memory-in-xbytes", &show_memory_in_xbytes, NULL);
+	if (show_memory_in_xbytes) {
+	  memory_human_size(memory_used, used);
+	  memory_human_size(memory_total, total);
+	  g_snprintf (memory_info, 64,"%s / %s", used, total);
+
+	  memory_human_size(swap_used, used);
+	  memory_human_size(swap_total, total);
+	  g_snprintf (swap_info, 64,"%s / %s", used, total);
+	} else {
+	  swap_percent = (swap_total != 0) ? swap_used * 100 / (gdouble)swap_total : 0;
+	  g_snprintf (memory_info, 64, "%.0f%%", memory_percent);
+	  g_snprintf (swap_info, 64, "%.0f%%", swap_percent);
+	}
 
-	xtm_task_manager_get_system_info (task_manager, &num_processes, &cpu, &memory, &swap);
-	xtm_process_window_set_system_info (XTM_PROCESS_WINDOW (window), num_processes, cpu, memory, swap);
+	xtm_process_window_set_system_info (XTM_PROCESS_WINDOW (window), num_processes, cpu, memory_info, memory_percent, swap_info);
 
 	xtm_task_manager_get_swap_usage (task_manager, &swap_free, &swap_total);
 	xtm_process_window_show_swap_usage (XTM_PROCESS_WINDOW (window), (swap_total > 0));
@@ -99,17 +118,17 @@
 		g_snprintf (tooltip, 1024,
 				_("<b>Processes:</b> %u\n"
 				"<b>CPU:</b> %.0f%%\n"
-				"<b>Memory:</b> %.0f%%\n"
-				"<b>Swap:</b> %.0f%%"),
-				num_processes, cpu, memory, swap);
+				"<b>Memory:</b> %s\n"
+				"<b>Swap:</b> %s"),
+				num_processes, cpu, memory_info, swap_info);
 		gtk_status_icon_set_tooltip_markup (GTK_STATUS_ICON (status_icon), tooltip);
 #else
 		g_snprintf (tooltip, 1024,
 				_("Processes: %u\n"
 				"CPU: %.0f%%\n"
-				"Memory: %.0f%%\n"
-				"Swap: %.0f%%"),
-				num_processes, cpu, memory, swap);
+				"Memory: %s\n"
+				"Swap: %s"),
+				num_processes, cpu, memory_info, swap_info);
 		gtk_status_icon_set_tooltip (GTK_STATUS_ICON (status_icon), tooltip);
 #endif
 	}
@@ -173,6 +192,7 @@
 	g_signal_connect_after (settings, "notify::more-precision", G_CALLBACK (force_timeout_update), NULL);
 	g_signal_connect_after (settings, "notify::full-command-line", G_CALLBACK (force_timeout_update), NULL);
 	g_signal_connect (settings, "notify::show-status-icon", G_CALLBACK (show_hide_status_icon), NULL);
+	g_signal_connect (settings, "notify::show-storage-in-bytes", G_CALLBACK (force_timeout_update), NULL);
 
 	g_signal_connect (window, "destroy", G_CALLBACK (destroy_window), NULL);
 	g_signal_connect (window, "delete-event", G_CALLBACK (delete_window), NULL);
diff -Naur xfce4-taskmanager-1.0.0-orig/src/process-statusbar.c xfce4-taskmanager-1.0.0/src/process-statusbar.c
--- xfce4-taskmanager-1.0.0-orig/src/process-statusbar.c	2010-06-02 01:02:40.000000000 +0200
+++ xfce4-taskmanager-1.0.0/src/process-statusbar.c	2013-06-20 18:54:13.071548850 +0200
@@ -45,8 +45,8 @@
 	GtkWidget *		label_swap;
 
 	gfloat			cpu;
-	gfloat			memory;
-	gfloat			swap;
+	gchar			memory[64];
+	gchar			swap[64];
 	guint			num_processes;
 };
 G_DEFINE_TYPE (XtmProcessStatusbar, xtm_process_statusbar, GTK_TYPE_STATUSBAR)
@@ -64,11 +64,11 @@
 	class->finalize = xtm_process_statusbar_finalize;
 	class->set_property = xtm_process_statusbar_set_property;
 	g_object_class_install_property (class, PROP_CPU,
-		g_param_spec_float ("cpu", "CPU", "CPU usage", 0, 100, 0, G_PARAM_CONSTRUCT|G_PARAM_WRITABLE));
+	        g_param_spec_float ("cpu", "CPU", "CPU usage", 0, 100, 0, G_PARAM_CONSTRUCT|G_PARAM_WRITABLE));
 	g_object_class_install_property (class, PROP_MEMORY,
-		g_param_spec_float ("memory", "Memory", "Memory usage", 0, 100, 0, G_PARAM_CONSTRUCT|G_PARAM_WRITABLE));
+                g_param_spec_string ("memory", "Memory", "Memory usage", "", G_PARAM_CONSTRUCT|G_PARAM_WRITABLE));
 	g_object_class_install_property (class, PROP_SWAP,
-		g_param_spec_float ("swap", "Swap", "Swap usage", 0, 100, 0, G_PARAM_CONSTRUCT|G_PARAM_WRITABLE));
+		g_param_spec_string ("swap", "Swap", "Swap usage", "", G_PARAM_CONSTRUCT|G_PARAM_WRITABLE));
 	g_object_class_install_property (class, PROP_SHOW_SWAP,
 		g_param_spec_boolean ("show-swap", "ShowSwap", "Show or hide swap usage", TRUE, G_PARAM_WRITABLE));
 	g_object_class_install_property (class, PROP_NUM_PROCESSES,
@@ -139,6 +139,7 @@
 	XtmProcessStatusbar *statusbar = XTM_PROCESS_STATUSBAR (object);
 	gchar *text;
 	gchar *float_value;
+	gchar *string_value;
 
 	switch (property_id)
 	{
@@ -152,20 +153,16 @@
 		break;
 
 		case PROP_MEMORY:
-		statusbar->memory = g_value_get_float (value);
-		float_value = rounded_float_value (statusbar->memory, statusbar->settings);
-		text = g_strdup_printf (_("Memory: %s%%"), float_value);
+		text = g_strdup_printf (_("Memory: %s"), g_value_get_string (value));
+		g_strlcpy(statusbar->memory, text, 64);
 		gtk_label_set_text (GTK_LABEL (statusbar->label_memory), text);
-		g_free (float_value);
 		g_free (text);
 		break;
 
 		case PROP_SWAP:
-		statusbar->swap = g_value_get_float (value);
-		float_value = rounded_float_value (statusbar->swap, statusbar->settings);
-		text = g_strdup_printf (_("Swap: %s%%"), float_value);
+		text = g_strdup_printf (_("Swap: %s"), g_value_get_string (value));
+		g_strlcpy(statusbar->swap, text, 64);
 		gtk_label_set_text (GTK_LABEL (statusbar->label_swap), text);
-		g_free (float_value);
 		g_free (text);
 		break;
 
@@ -196,4 +193,3 @@
 {
 	return g_object_new (XTM_TYPE_PROCESS_STATUSBAR, NULL);
 }
-
diff -Naur xfce4-taskmanager-1.0.0-orig/src/process-window.c xfce4-taskmanager-1.0.0/src/process-window.c
--- xfce4-taskmanager-1.0.0-orig/src/process-window.c	2010-06-13 17:59:12.000000000 +0200
+++ xfce4-taskmanager-1.0.0/src/process-window.c	2013-06-20 19:19:04.770553857 +0200
@@ -364,6 +364,7 @@
 	menu_preferences_append_item (GTK_MENU (menu), _("More precision"), "more-precision", window->priv->settings);
 	menu_preferences_append_item (GTK_MENU (menu), _("Full command line"), "full-command-line", window->priv->settings);
 	menu_preferences_append_item (GTK_MENU (menu), _("Show status icon"), "show-status-icon", window->priv->settings);
+	menu_preferences_append_item (GTK_MENU (menu), _("Show memory usage in bytes"), "show-memory-in-xbytes", window->priv->settings);
 
 	refresh_rate_menu = build_refresh_rate_menu (window->priv->settings);
 	mi = gtk_menu_item_new_with_label (_("Refresh rate"));
@@ -491,7 +492,7 @@
 }
 
 void
-xtm_process_window_set_system_info (XtmProcessWindow *window, guint num_processes, gfloat cpu, gfloat memory, gfloat swap)
+xtm_process_window_set_system_info (XtmProcessWindow *window, guint num_processes, gfloat cpu, gchar *memory, gfloat memory_percent, gchar *swap)
 {
 	gchar text[100];
 	gchar value[4];
@@ -506,9 +507,8 @@
 	g_snprintf (text, 100, _("CPU: %s%%"), value);
 	gtk_widget_set_tooltip_text (window->priv->cpu_monitor, text);
 
-	xtm_process_monitor_add_peak (XTM_PROCESS_MONITOR (window->priv->mem_monitor), memory / 100.0);
-	g_snprintf (value, 4, "%.0f", memory);
-	g_snprintf (text, 100, _("Memory: %s%%"), value);
+	xtm_process_monitor_add_peak (XTM_PROCESS_MONITOR (window->priv->mem_monitor), memory_percent / 100);
+	g_snprintf (text, 100, _("Memory: %s"), memory);
 	gtk_widget_set_tooltip_text (window->priv->mem_monitor, text);
 }
 
@@ -519,4 +519,3 @@
 	g_return_if_fail (GTK_IS_STATUSBAR (window->priv->statusbar));
 	g_object_set (window->priv->statusbar, "show-swap", show_swap_usage, NULL);
 }
-
diff -Naur xfce4-taskmanager-1.0.0-orig/src/process-window.h xfce4-taskmanager-1.0.0/src/process-window.h
--- xfce4-taskmanager-1.0.0-orig/src/process-window.h	2010-06-08 22:41:38.000000000 +0200
+++ xfce4-taskmanager-1.0.0/src/process-window.h	2013-06-20 18:54:13.072548863 +0200
@@ -29,7 +29,7 @@
 GType		xtm_process_window_get_type			(void);
 GtkWidget *	xtm_process_window_new				();
 GtkTreeModel *	xtm_process_window_get_model			(XtmProcessWindow *window);
-void		xtm_process_window_set_system_info		(XtmProcessWindow *window, guint num_processes, gfloat cpu, gfloat memory, gfloat swap);
+void		xtm_process_window_set_system_info		(XtmProcessWindow *window, guint num_processes, gfloat cpu, gchar *memory, gfloat memory_percent, gchar *swap);
 void		xtm_process_window_show_swap_usage		(XtmProcessWindow *window, gboolean show_swap_usage);
 
 #endif /* !PROCESS_WINDOW_H */
diff -Naur xfce4-taskmanager-1.0.0-orig/src/settings.c xfce4-taskmanager-1.0.0/src/settings.c
--- xfce4-taskmanager-1.0.0-orig/src/settings.c	2010-06-02 01:02:40.000000000 +0200
+++ xfce4-taskmanager-1.0.0/src/settings.c	2013-06-20 19:20:19.579505646 +0200
@@ -35,6 +35,7 @@
 	PROP_MORE_PRECISION,
 	PROP_FULL_COMMAND_LINE,
 	PROP_SHOW_STATUS_ICON,
+	PROP_SHOW_MEMORY_IN_XBYTES,
 	PROP_REFRESH_RATE,
 	PROP_COLUMNS_POSITIONS,
 	PROP_COLUMN_UID,
@@ -88,6 +89,8 @@
 		g_param_spec_boolean ("full-command-line", "FullCommandLine", "Full command line", FALSE, G_PARAM_READWRITE));
 	g_object_class_install_property (class, PROP_SHOW_STATUS_ICON,
 		g_param_spec_boolean ("show-status-icon", "ShowStatusIcon", "Show/hide the status icon", TRUE, G_PARAM_READWRITE));
+	g_object_class_install_property (class, PROP_SHOW_MEMORY_IN_XBYTES,
+		g_param_spec_boolean ("show-memory-in-xbytes", "ShowMemoryInXBytes", "Show memory usage in bytes", FALSE, G_PARAM_READWRITE));
 	g_object_class_install_property (class, PROP_REFRESH_RATE,
 		g_param_spec_uint ("refresh-rate", "RefreshRate", "Refresh rate in milliseconds", 0, G_MAXUINT, 750, G_PARAM_READWRITE));
 	g_object_class_install_property (class, PROP_COLUMNS_POSITIONS,
diff -Naur xfce4-taskmanager-1.0.0-orig/src/task-manager.c xfce4-taskmanager-1.0.0/src/task-manager.c
--- xfce4-taskmanager-1.0.0-orig/src/task-manager.c	2010-06-08 22:41:38.000000000 +0200
+++ xfce4-taskmanager-1.0.0/src/task-manager.c	2013-06-20 18:54:13.073548876 +0200
@@ -219,28 +219,6 @@
 }
 
 static void
-memory_human_size (guint64 mem, gchar *mem_str)
-{
-	guint64 mem_tmp;
-
-	mem_tmp = mem / 1024 / 1024;
-	if (mem_tmp > 3)
-	{
-		g_snprintf (mem_str, 64, _("%lu MiB"), (gulong)mem_tmp);
-		return;
-	}
-
-	mem_tmp = mem / 1024;
-	if (mem_tmp > 8)
-	{
-		g_snprintf (mem_str, 64, _("%lu KiB"), (gulong)mem_tmp);
-		return;
-	}
-
-	g_snprintf (mem_str, 64, _("%lu B"), (gulong)mem);
-}
-
-static void
 #ifdef HAVE_WNCK
 model_update_tree_iter (GtkTreeModel *model, GtkTreeIter *iter, Task *task, App *app)
 #else
@@ -396,10 +374,11 @@
 }
 
 void
-xtm_task_manager_get_system_info (XtmTaskManager *manager, guint *num_processes, gfloat *cpu, gfloat *memory, gfloat *swap)
-{
-	guint64 memory_used, swap_used;
+xtm_task_manager_get_system_info (XtmTaskManager *manager, guint *num_processes, gfloat *cpu,
+				  guint64 *memory_used, guint64 *memory_total,
+				  guint64 *swap_used, guint64 *swap_total)
 
+{
 	g_return_if_fail (XTM_IS_TASK_MANAGER (manager));
 
 	/* Set number of processes */
@@ -409,11 +388,10 @@
 	get_memory_usage (&manager->memory_total, &manager->memory_free, &manager->memory_cache, &manager->memory_buffers,
 			&manager->swap_total, &manager->swap_free);
 
-	memory_used = manager->memory_total - manager->memory_free - manager->memory_cache - manager->memory_buffers;
-	swap_used = manager->swap_total - manager->swap_free;
-
-	*memory = (manager->memory_total != 0) ? memory_used * 100 / (gdouble)manager->memory_total : 0;
-	*swap = (manager->swap_total != 0) ? swap_used * 100 / (gdouble)manager->swap_total : 0;
+	*memory_used = manager->memory_total - manager->memory_free - manager->memory_cache - manager->memory_buffers;
+	*memory_total = manager->memory_total;
+	*swap_used = manager->swap_total - manager->swap_free;
+	*swap_total = manager->swap_total;
 
 	/* Set CPU usage */
 	get_cpu_usage (&manager->cpu_count, &manager->cpu_user, &manager->cpu_system);
@@ -631,6 +609,28 @@
 
 
 void
+memory_human_size (guint64 mem, gchar *mem_str)
+{
+	guint64 mem_tmp;
+
+	mem_tmp = mem / 1024 / 1024;
+	if (mem_tmp > 3)
+	{
+		g_snprintf (mem_str, 64, _("%lu MiB"), (gulong)mem_tmp);
+		return;
+	}
+
+	mem_tmp = mem / 1024;
+	if (mem_tmp > 8)
+	{
+		g_snprintf (mem_str, 64, _("%lu KiB"), (gulong)mem_tmp);
+		return;
+	}
+
+	g_snprintf (mem_str, 64, _("%lu B"), (gulong)mem);
+}
+
+void
 get_owner_uid (guint *owner_uid, gchar **owner_uid_name)
 {
 	uid_t uid;
diff -Naur xfce4-taskmanager-1.0.0-orig/src/task-manager.h xfce4-taskmanager-1.0.0/src/task-manager.h
--- xfce4-taskmanager-1.0.0-orig/src/task-manager.h	2010-06-09 13:50:23.000000000 +0200
+++ xfce4-taskmanager-1.0.0/src/task-manager.h	2013-06-20 18:54:13.074548889 +0200
@@ -64,7 +64,9 @@
 XtmTaskManager *	xtm_task_manager_new				(GtkTreeModel *model);
 const gchar *		xtm_task_manager_get_username			(XtmTaskManager *manager);
 const gchar *		xtm_task_manager_get_hostname			(XtmTaskManager *manager);
-void			xtm_task_manager_get_system_info		(XtmTaskManager *manager, guint *num_processes, gfloat *cpu, gfloat *memory, gfloat *swap);
+void			xtm_task_manager_get_system_info		(XtmTaskManager *manager, guint *num_processes, gfloat *cpu,
+									 guint64 *memory_used, guint64 *memory_total,
+									 guint64 *swap_used, guint64 *swap_total);
 void			xtm_task_manager_get_swap_usage			(XtmTaskManager *manager, guint64 *swap_free, guint64 *swap_total);
 const GArray *		xtm_task_manager_get_task_list			(XtmTaskManager *manager);
 void			xtm_task_manager_update_model			(XtmTaskManager *manager);
@@ -90,6 +92,7 @@
 	XTM_PRIORITY_VERY_HIGH,
 };
 
+void            memory_human_size       (guint64 mem, gchar *mem_str);
 void		get_owner_uid		(guint *owner_uid, gchar **owner_uid_name);
 gchar *		get_hostname		();
 gboolean	send_signal_to_pid	(guint pid, gint xtm_signal);